qcom: clock-cpu-8994: Add support for MSM8992

The cpu clock trees for MSM8994v2 and MSM8992 are very similar. Hence,
add support in the MSM8994 cpu clock driver for MSM8992 and use the
same driver on both.

Change-Id: I04579b4467cafc9b8e4fc70cb8f1f01130f54c16
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>