defconfig: gen3auto: Enable SPMI PMIC drivers

Enable MFD SPMI PMIC driver and several SPMI and PMIC drivers
which are needed to provide baseline support of PMIC peripherals.

Change-Id: Ic0b24c62bec654c61bbf0034c20d775d686eb9c4
Signed-off-by: Veera Vegivada <vvegivad@codeaurora.org>