Update dev-mcxa and dev-npcx to use embedded-io v0.7

[tullom]

Currently, uart-service in embedded-services uses embedded-io v0.6. embassy-mcxa uses embedded-io v0.7 and embassy-npcx doesn't have any impl at all. Once uart-service uses the newest version of embedded-io, remove UartAdapter from dev-mcxa and update the UartWrap in dev-npcx to use embedded-io v0.7.

[kurtjd]

Adding a note for myself here to update the qemu-riscv HAL to use v0.7 as well.

[kurtjd]

embedded-services PR to update: OpenDevicePartnership/embedded-services#842
qemu-hal PR to update: kurtjd/qemu-riscv-rs#2

Once the embedded-services PR is in should be good to update here

[kurtjd]

Have PR up to upgrade npcx HAL to v7 (as well as impl the traits for the unsplit uart so we don't need a wrapper for that): OpenDevicePartnership/embassy-npcx#39

Need to submit a PR to the mxca HAL to impl the traits for the unsplit BbqUart instance (it only implements the traits on the split Tx and Rx structs).