arm: dts: msm: Modify QOS mode for GPU on APQ8084

Modify the QOS mode for GPU on BIMC fabric. This change is needed to
prevent GPU from getting the lowest priority on BIMC.

Change-Id: I790f5c39a649a5136991608b42699181279b94e7
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>