ARM: dts: msm: Update clock frequencies for msm8996AU

Add the CPU and GPU clock frequency tables in device tree
to support MSM8996 auto. These overrides apply for both
v3 and pro based msm8996AU.

CRs-Fixed: 1039602
Change-Id: I092c0767570cf500886b75823f24346097676473
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>