regulator: kryo-regulator: Disallow LDO retention mode by default

The default state for kryo-retention regulators is bypassed mode
(i.e BHS), since LDO retention can only be allowed under certain
operation conditions. APCC_PWR_CTL_OVERRIDE should be initialized
to reflect this requirement.

Change-Id: Ibc732bfc44f917a89e144671dbb396fe6b95ce32
Signed-off-by: Osvaldo Banuelos <osvaldob@codeaurora.org>