intel_scu_ipc: move error check out of the loop

This is small performance optimization of the busy_loop().

While here, use BIT() macro instead of plain integers when check the status.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

diff --cc drivers/platform/x86/intel_scu_ipc.c
Simple merge