Nokia RX-51: Fix crashing in U-Boot mmc function omap_hsmmc_stop_clock()

After commit 04a2ea248f ("mmc: disable UHS modes if Vcc cannot be
switched on and off") U-Boot started crashing on Nokia RX-51 while
initializing mmc and caused reboot loop.

It looks like that some clocks were not enabled and this patch fixes U-Boot
mmc crash.

Signed-off-by: Pali Rohár <pali@kernel.org>
Cc: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>

board/nokia/rx51/rx51.c

@@ -202,6 +202,8 @@ int board_init(void)
 {
 	/* in SRAM or SDRAM, finish GPMC */
 	gpmc_init();
+	/* Enable the clks & power */
+	per_clocks_enable();
 	/* boot param addr */
 	gd->bd->bi_boot_params = OMAP34XX_SDRC_CS0 + 0x100;
 	return 0;