The boot hangs with the message:
mmc0: error -110 whilst initialising SD card

The MMC driver has issues initializing when PREEMPT is enabled (either forced
or voluntary). Unplugging and then plugging the card back will reset the
driver and continue booting. Alternatively, disable preemption.

Signed-off-by: Denys Dmytriyenko <denys@ti.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>