s5j/pm: fix invalid build rule on PM
s5j/pm: fix invalid build rule on PM

s5j_pm*.c should be included when CONFIG_PM=y, not
CONFIG_ARCH_CUSTOM_PMINIT.

Change-Id: I14ff07bf542c8e8e3a1c73b26328558a51f50ac2
Signed-off-by: Heesub Shin <45471ea77bd08f3d26635f3f5adb40ba41250a2b@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT