ENGR00119275 ipuv3: dmfc size control

add dmfc size control for dynamic change and _setup.
DMFC_NORMAL: segment 0,1 for DC, 4,5 for DP-BG, 6,7 for DP-FG.
DMFC_HIGH_RESOLUTION_DC: segment 0~3 for DC, 4,5 for DP-BG, 6,7 for DP-FG.
DMFC_HIGH_RESOLUTION_DP: segment 0,1 for DC, 2~5 for DP-BG, 6,7 for DP-FG.
DMFC_HIGH_RESOLUTION_ONLY_DP: segment 0~3 for DP-BG, 4~7 for DP-FG.
IPU diplay driver will try to enlarge its related DMFC segment size
when it meet high resolution condition, but if dmfc is already in high
resolution setting, dmfc will not change.That said, first request wins.

For cmdline setting, "dmfc=1" is DMFC_HIGH_RESOLUTION_DC, "dmfc=2"
is DMFC_HIGH_RESOLUTION_DP, "dmfc=3" is
DMFC_HIGH_RESOLUTION_ONLY_DP.

NOTE: DMFC_HIGH_RESOLUTION_ONLY_DP only can be set by cmdline.

Signed-off-by: Jason Chen <b02280@freescale.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>