s5j/sflash: simplify struct s5j_sflash_dev_s
s5j/sflash: simplify struct s5j_sflash_dev_s

This commit eliminates 'struct s5j_sflash_priv_s' which is a
sub-structure of 'struct s5j_sflash_dev_s'. There is no benefit to do
so.

Change-Id: Ib0d1c1643d09f36440d995035109b518862d15d9
Signed-off-by: Heesub Shin <45471ea77bd08f3d26635f3f5adb40ba41250a2b@samsung.com>

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