Add bindings for the I2C PMIC Controller. This device handles
interrupts from an I2C PMIC and supports various subnodes which
each correspond to a PMIC peripheral (e.g. LDO regulator, GPIO,
etc).
Change-Id: I83528bd1239f1eb645f17a579216edc616ff2fcd
Signed-off-by: David Collins <quic_collinsd@quicinc.com>