video: msm: Fix MDP bus bandwidth calculation

 * Set values for 8064 (JF) in board file
 * Remove redundant calculations
 * Use 64-bit unsigned long values where appropriate

Change-Id: I185f077456f55805adec7d74d9845857f264a528
msm_fb: display: keep a minimum mdp ib bandwidth request

The calculated ab and ib bandwidth requests are very small which cause
underruns if mdp composites only very small layers. For these use
cases keeping a minimum ib request based on the baselayer size can
prevent underruns and no power impact is observed.

CRs-fixed: 472444
Change-Id: I08e77610aafdfa84c5c2a882a0c95a51950aa069
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>
video: msm: Remove dead code

Change-Id: If141888cc45a921c97ffd6647b08a1422424b50e