fsl_esdhc: add support for mx51 processor

The esdhc controller in the mx51 processor is quite
the same as the one in some powerpc processors
(MPC83xx, MPC85xx). This patches adapts the driver
to support the arm mx51.

Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/lib_arm/board.c b/lib_arm/board.c
index e148739..f5660a9 100644
--- a/lib_arm/board.c
+++ b/lib_arm/board.c
@@ -243,6 +243,9 @@
 	interrupt_init,		/* set up exceptions */
 #endif
 	timer_init,		/* initialize timer */
+#ifdef CONFIG_FSL_ESDHC
+	get_clocks,
+#endif
 	env_init,		/* initialize environment */
 	init_baudrate,		/* initialze baudrate settings */
 	serial_init,		/* serial communications setup */