rtc: omap: add option device to be a wakeup source

Get wakeup capabilty of the device via platform data.

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
DA8xx: Force DaVinci UART's to be of AR7 port type

Since AR7 port type is better match for DaVinci UARTs, patch
forces DA8xx UART's to AR7 port type which enables AFE
capability on the ports.

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>