ARM: dts: msm: fix video VA range for sm8150 and sdmmagpie

After video virtual addr pool start address is modified,
should also modify pool size to make sure the VA range is
within programmable range.

Change-Id: Id8c2cc3760c9ddac5f74a3f632a68b210078c37d
Signed-off-by: Qiwei Liu <qiweil@codeaurora.org>