arm: omap2+: serial: remove no_console_suspend support

"no_console_suspend" is no longer handled in platform file,
Since the omap serial driver is now adapted to prevent
console UART idleing during suspend.

Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Rajendra nayak <rnayak@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Kevin Hilman <khilman@linaro.org>