msm: mdss: Add bus/bandwidth related changes for ferrum

Ferrum has one AXI port of width 128 compared to 8x10 which had two
AXI ports of width 64. Add changes to take care of this.

Change-Id: I8644769d2133f42cb0602b6a4cc726772e233aec
Signed-off-by: Shivaraj Shetty <shivaraj@codeaurora.org>