arm: gic: create empty stub gic_set_wake when !CONFIG_PM

Return success when CONFIG_PM is not defined instead of
returning failure.

Change-Id: Ibbdde7460d68d49d0554d88d77ddef3bec01508c
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
1 file changed