ARM: dts: msm: remove mdss-high-ib-factor

This factor was used to increase mdp bandwidth request and now it is
not needed any more after mdp driver implemented bandwidth calculation
equations.

Change-Id: I94c4f2499eb09a2db268a3db55bf7172a96315b5
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>