msm: rpm-regulator: add max_uV check into set voltage functions

Check that the final set point voltage selected inside of both
vreg_set_voltage and rpm_vreg_set_voltage is not greater than
the max_uV value specified by a given consumer.

Change-Id: Ia1a8a5e2ad2465e343dd2897e9306d3705c79dbf
Signed-off-by: David Collins <collinsd@codeaurora.org>