ENGR00315894-78 vadc: Add vadc module

ENGR00315894-78 vadc: Add vadc module

Add vadc module.
Both PAL and NTSC mode can work.

Signed-off-by: Sandor Yu <R01008@freescale.com>
Signed-off-by: Ye.Li <B37916@freescale.com>
(cherry picked from commit 03c31ae30c1e81c99f6824221e4801433445e04a)
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
(cherry picked from commit b5d776ffc1519c16091736445b3217ffb7fcd7db)
(cherry picked from commit 2377eb9fd299b76888f11faf76383b68e77bcc8a)
(cherry picked from commit 808d447235bd0f9134c7d00fa480cd55b4e0426e)
(cherry picked from commit 99977a1152981247a84252dba1d1cf55c0406b08)