ipc: pm: don't WFI when waiting for PM D3

Use a while loop instead.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

src/ipc/apl-ipc.c

@@ -138,8 +138,7 @@ void ipc_platform_do_cmd(struct ipc *ipc)
 	// TODO: signal audio work to enter D3 in normal context
 	/* are we about to enter D3 ? */
 	if (iipc->pm_prepare_D3) {
-		while (1)
-			wait_for_interrupt(0);
+		while (1) {};
 	}
 
 	tracev_ipc("CmD");

src/ipc/byt-ipc.c

@@ -159,10 +159,7 @@ void ipc_platform_do_cmd(struct ipc *ipc)
 	// TODO: signal audio work to enter D3 in normal context
 	/* are we about to enter D3 ? */
 	if (iipc->pm_prepare_D3) {
-		while (1) {
-			trace_ipc("pme");
-			wait_for_interrupt(0);
-		}
+		while (1) {};
 	}
 
 	tracev_ipc("CmD");

src/ipc/cnl-ipc.c

@@ -140,8 +140,7 @@ void ipc_platform_do_cmd(struct ipc *ipc)
 	// TODO: signal audio work to enter D3 in normal context
 	/* are we about to enter D3 ? */
 	if (iipc->pm_prepare_D3) {
-		while (1)
-			wait_for_interrupt(0);
+		while (1) {};
 	}
 
 	tracev_ipc("CmD");

src/ipc/hsw-ipc.c

@@ -155,10 +155,7 @@ void ipc_platform_do_cmd(struct ipc *ipc)
 	// TODO: signal audio work to enter D3 in normal context
 	/* are we about to enter D3 ? */
 	if (iipc->pm_prepare_D3) {
-		while (1) {
-			trace_ipc("pme");
-			wait_for_interrupt(0);
-		}
+		while (1) {};
 	}
 
 	tracev_ipc("CmD");