arm/dt: Add nodes for multiple partitions in msm_vidc

Modified dts files to support multiple partitions
and corresponding buffer types in each context
bank domain for msm8974v2, msm8226, and msm8610

Change-Id: Ia5db3ff21a1fdb2976099e70b99c48feb07884e3
Signed-off-by: Eric Ho <yinlokh@codeaurora.org>