ARM: S5P: Add SROM bank 4 and 5 register offsets

Some of the S5P platforms like S5PC100 and S5PV210 include SROM banks
4 and 5 in addition to SROM banks 0 to 3. This patch adds register
offsets for SROM bank 4 and 5.

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>