display: m2: Reduce mdp bus vectors

Reduce bandwidth back to where it was before importing updates from
Samsung
drivers: video: mdp4: Minor formatting clean up

The 'if's bothered me...
drivers: video: mdp4: Fix building with gcc-4.8/graphite

Not entirely sure what caused the following error (didn't pinpoint
it), but since the minimum_[ab/ib] are of the unsigned 64-bit type,
this error can be  bypassed (and the div function possibly optimized)
by using div_u64.

The API also notes that "This is the most common 64bit divide and
should be used if possible"

Fixes error:
  undefined reference to `__aeabi_uldivmod'