ARM: exynos4: convert logical CPU numbers to physical numbers

This patch uses the new cpu_logical_map() macro for converting logical
CPU numbers into physical numbers when dealing with the pen_release
variable in the SMP boot and CPU hotplug paths.

Cc: Kukjin Kim <kgene.kim@samsung.com>
Tested-and-acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>