ARM: PSCI: remove unnecessary include of arm-gic.h

Now that gic_secondary_init is no longer needed to be called by SMP init
functions, the header is not needed.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-commit: 97fc4de3d93fea934b0ec8332465b9f1899a9adb
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>