ARM: dts: msm: Correct the MSM8996V3 cpu clock device tree

The compatible string is missing the "qcom," prefix. Fix it.
Also, fix the early initcall DT check as well to correctly
bail out when a non-MSM8996 device is encountered.

Change-Id: I5c61ce6d7c7f9406ffad39f15a76891ba368bdae
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>