s5j/sflash: do not configure pinmux
s5j/sflash: do not configure pinmux

As it is already configured at BL0/BL1/BL2 stages, we do not need to
configure pinmux for SFLASH again.

Change-Id: I627e59e3c9a04a3c770c893bc833d9cc042df3f5
Signed-off-by: Heesub Shin <45471ea77bd08f3d26635f3f5adb40ba41250a2b@samsung.com>

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