msm: video: Update macros to use readl/writel

Currently, video code uses macros other than readl/writel
to read/write from memory mapped registers. While technically
correct, this prevents readl/writel logging from working as
expected. Change the video macros to use readl/writel
internally.

Change-Id: Ia5b71849491b31f4c8dd04cd4228bb30602a78c4
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>