ARM: dts: msm: Update GPU PM QoS Vote for SDM845

As per recent measurement cpu low power mode latencies are
better than the existing. Hence update the graphics PmQos
vote to block the cpu collapse with this updated latency.

CRs-Fixed: 2105962
Change-Id: I0b6a793ef4f76bc25dc9169187ba19ffa9c6c3bc
Signed-off-by: Krishna Vanka <kvanka@codeaurora.org>
Signed-off-by: George Shen <sqiao@codeaurora.org>