ARM: 6139/1: ARMv7: Use the Inner Shareable I-cache on MP

This patch fixes the flush_cache_all for ARMv7 SMP.It was
missing from commit b8349b56

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@kernel.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>