fiq_debugger: allow compiling without CONFIG_FIQ_GLUE

Allow compiling fiq_debugger.c without CONFIG_FIQ_GLUE for
platforms that don't support FIQs.

Change-Id: Iabdfd790d24fa9d47b29d2f850c567af2dcad78f
Signed-off-by: Colin Cross <ccross@android.com>
Git-commit: ab71250a48be67b7445a864408fd99f0410d610e
Git-repo: https://android.googlesource.com/kernel/common.git


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