ARM: common: fiq_debugger: add irq context debug functions

This code is moved here from the drivers/misc/kernel_debugger.

Change-Id: Iccf21c4313a8516a917125ca93f64baa5f354228
Signed-off-by: Dima Zavin <dima@android.com>

Conflicts:
	arch/arm/common/fiq_debugger.c