fiq_debugger: rename debug->fiq_debugger

Rename variables and functions in the global namespace to avoid
future collisions.

Change-Id: Ic23a304b0f794efc94cc6d086fddd63231d99c98
Signed-off-by: Colin Cross <ccross@android.com>
Git-commit: a6273046d9cfdcff141250fda616b3b80cadc492
Git-repo: https://android.googlesource.com/kernel/common.git


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