msm: clock-8974: Add support for additional RPM controlled PMIC clocks

The DIV and DIFF clocks generated in the PMIC are supported by
the RPM. Add support for these clocks in the Linux clock driver.

Change-Id: I179e43c0964028eef30f10f545463b803e9b8e7d
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>