ARM: arm1176: Define arch_cpu_init() for s3c64xx

arch_cpu_init() is removed from cpu level to SOC level for arm1176
in commit 4ea6d6b,the same is done for s3c64xx

Signed-off-by: Ashok Kumar Reddy <ashokkourla2000@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>