MLK-10774-2 HDMI: splash screen function enhancement

MLK-10774-2 HDMI: splash screen function enhancement

-Change HDMI video mode to VGA.
-Add pixel clock fraction part setting in IPU driver,
 fix video mode timing issue.
-Add overflow state clear workaround,
 fix kernel hang in HDMI driver issue.
-Correct IPU clock to 264MHz.

Signed-off-by: Sandor Yu <R01008@freescale.com>
Signed-off-by: Nitin Garg <nitin.garg@freescale.com>
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 5028519b434d5dfbe53c48ac4b115ff8b69bbac7)
(cherry picked from commit 8dcbd43b971616fb67dc3b2af32e2d33f68ed0ce)
(cherry picked from commit 46b20bec72b53f10c1edf0bd8add5b356fbd7c42)