ANDROID: 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>

[AmitP: Folded following android-4.9 commit changes into this patch
        daeea72326db ("ANDROID: fiq_debugger: Build fixes for 4.1")]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>