msm: clock: Add 'gp' clocks for 8660, 8960, 8064, and 9615

The frequency tables are populated with example clock rates, but
board-specific customization is expected. All three drivers use
identical implementations, except for the missing PXO support
on 9615 and different Fmax data between SoCs.

Change-Id: I482a9398abc7ffa624d146a3abe5744d5db1ca35
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>