ARM: dts: msm: set per-pipe bandwidth limit to 1.5GBps for apq8084

Set the bandwidth limit per pipe to the recommended 1.5GBps.
This fixes some of the underruns observed during video
playback with HDMI connected scenarios.

CRs-Fixed: 609251
Change-Id: If4a31ddb096df4b90b3c4e5394cab6f54e0f79a8
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>