ARM: dts: msm: Update max Venus cumulative load for 8937 and 8917

Increase vidc max-hw-load to support legacy wfd with concurrent
1080p@30fps decode and 720p@30fps encode sessions.

Change-Id: I447fb888763692649942c2b1768c279d95e22cd9
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>