linux-phytec-fsl

rtc: omap: Add internal clock enabling support

The rtc can be clocked by an internal 32K clock. Adding the support
to enable the same.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>