power: smb5: Explicitly enable USBIN AICL for redundancy

USBIN_AICL_EN is set by default in PMIC. Not altered anywhere in charger
driver, this bit is still seen cleared occasionally in HLOS, which causes
reverse boost.

Explicitly enable it during probe.

CRs-Fixed: 2266383
Change-Id: I2ddb099cd40fac837113bfe29f89681eedf69385
Signed-off-by: Harry Yang <harryy@codeaurora.org>