arm: imx53-qsrb: fix initcalls on START-R board

The compatible changed when we switched to the upstream
DTs, so the initcalls would not be executed on the START-R
board.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>