clk: qcom: clock-a7: Populate OPP tables for cpu clocks

Populate A7 frequency-to-corner mappings in OPP devices. Add a device tree
property to allow registering with the framework.

Change-Id: I1fd180f2e08eb53d52fc04f3fd65b39fe272f15d
Signed-off-by: Taniya Das <tdas@codeaurora.org>