ARM: dts: qcom: Update implementation defined register values for msm8996

The implementation defined register values for certain smmu's
has been updated. Reflect the same in the dtsi. 8996v1/v2 device
trees are no longer supported, thus rename the file.

Change-Id: I687f8a23dd14689210a7c906369b51bda20ab637
Signed-off-by: Neeti Desai <neetid@codeaurora.org>