fiq_debugger: split arm support into fiq_debugger_arm.c

Split arm support into a separate .c file that is only built for
CONFIG_ARM.

Change-Id: Iba16f4d51608bf9c3e5c8acefefcd38fead9797c
Signed-off-by: Colin Cross <ccross@android.com>
Git-commit: 86098e6f33f71d31374dc01f452dcb0ed919145d
Git-repo: https://android.googlesource.com/kernel/common.git


Signed-off-by: Ian Maund <imaund@codeaurora.org>