ARM: dts: msm: Add support for speed-bin 2 for MSM8996v3

Add speed-bin 2 to support the fmax of 1.9GHz and 1.5GHz
for perf and power clusters respectively.
Also add speed-bin 2 to support the fmax of 560MHz for GPU clock.

Change-Id: I9bc547b0f8a2f2c7cad04ec8c967ed580755ae75
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>