isp: enable sensor power via ACPI and make set file load non-fatal

[CleoMenezesJr]

On MacBook Air (BCM1570), probe fails with error -5 because the ISP rejects CISP_CMD_CH_SET_FILE_LOAD with 0xfffe (UNKNOWN COMMAND).

isp_enable_sensor() was a no-op, now powers on the sensor CMOS via ACPI CMPE + 100 ms delay before ISP init
CISP_CMD_CH_SET_FILE_LOAD failure is now non-fatal, consistent with the existing comment "The set file is allowed to be missing"

Tested on MacBook Air A1466 (Mid 2013), Fedora 44, kernel 7.0.4.
Fixes #321.

$ uname -r modinfo facetimehd | grep -E "version|filename" journalctl -k | grep facetimehd

7.0.4-200.fc44.x86_64
filename:       /lib/modules/7.0.4-200.fc44.x86_64/extra/facetimehd/facetimehd.ko
May 10 01:16:36 fedora kernel: facetimehd: loading out-of-tree module taints kernel.
May 10 01:16:36 fedora kernel: facetimehd: module verification failed: signature and/or required key missing - tainting kernel
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Found FaceTime HD camera with device id: 1570
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Setting 64bit DMA mask
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: S2 PCIe link init succeeded
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Refclk: 25MHz (0xa)
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: PLL reset finished
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Waiting for S2 PLL to lock at 450 MHz
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: S2 PLL is locked after 10 us
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: S2 PLL is in bypass mode
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: DDR40 PHY PLL locked on safe settings
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: STRAP valid
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Configuring DDR PLLs for 450 MHz
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: DDR40 PLL is locked after 0 us
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: First DDR40 VDL calibration completed after 2 us
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Second DDR40 VDL calibration completed after 2 us
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Using step size 154
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: VDL set to: coarse=0x10008, fine=0x1011b
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Virtual VTT enabled
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: S2 DRAM memory address: 0x22159559
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Rewrite DDR mode registers succeeded
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Full memory verification succeeded! (0)
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Loaded firmware, size: 1392kb
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: ISP woke up after 0ms
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Number of IPC channels: 7, queue size: 44865
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Firmware requested heap size: 3072kb
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: ISP second int after 0ms
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Channel description table at 00800000
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: magic value: 00000000 after 0 ms
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: Enabling interrupts
May 10 01:16:36 fedora kernel: facetimehd 0000:02:00.0: set file load failed (-5), continuing without calibration