ARM: dts: msm: update mem region on msm8996 auto boards

Due to early RVC will continue running during the whole device
bootup period, so RVC's reserved memory should be updated to
contiguous-region to avoid smmu fault.

CRs-Fixed: 2225630
Change-Id: I5d1510f4e9079f6ddd5630b0b736d0d49bc0992b
Signed-off-by: Guchun Chen <guchunc@codeaurora.org>