Add spmi-pmic-arb devices for the primary SPMI buses.
Add an SPMI debug bus device and associated child devices.
Add PMIC Glink devices and their client devices and Glink SPMI debug
controller device.
Add common PMIC configurations for all ravelin platforms.
Add PMI-specific support for ravelin on PM7250B and PMI632.
Change-Id: I075cde889f014d756cdcd3cf82421088aab703b7