OMAP3: SERIAL: Initialize all omap-uarts for zoom boards

Initialize all omap-uarts for zoom boards.  Now zoom_peripheral_init
will initialise all uarts for 3630. 3630sdp_board_init call
zoom_peripheral_init so we can now remove serial_init from 3630sdp
board init as zoom_peripheral_init now will do that the same.

Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>