msm: clock-generic: Add generic library for divider clocks

The generic divider clock library can support fixed divider clocks and
divider clocks that can support a range of divider values.

Change-Id: I9c03a4b01abad3f7f73d56f89a9e8caef30067c3
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>