mfd: rohm-bd96801: Support ROHM BD96802

mfd: rohm-bd96801: Support ROHM BD96802

The ROHM BD96802 PMIC looks from software point of view a lot like ROHM
BD96801 PMIC. Just with reduced number of voltage rails. Both PMICs
provide two physical IRQ lines referred as INTB and ERRB and contain
blocks implementing regulator controls and a weatchdog. Hence it makes
sense to use same MFD core for both PMICs.

Add support for ROHM BD96802 scalable companion PMIC to the BD96801
core driver.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/05957d194425a79a4f35f287695c3d9ca2ed1ae2.1744090658.git.mazziesaccount@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>