ARM: S5P: Add initial map for GPIO2 and GPIO3

This patch adds initial map for GPIO2 and GPIO3.
S5PV310/S5PC210 has separated GPIO1, GPIO2 and GPIO3.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Sangbeom Kim <sbkim73@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>