power: smb1355: Detect SMB1354

Add support for detecting whether the chip is SMB1355 or SMB1354 (a
variant of SMB1355). This is accomplished by reading the contents of the
REVID_MFG_ID_SPARE_REG.

CRs-Fixed: 2170280
Change-Id: I7799bfbdbda44f250ebec266ecf5adc0035398bf
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>