ARM: mach-imx: Support for DryIce RTC in i.MX53

This patch enables support for i.MX53 in addition to i.MX25 by providing a
dummy clock on i.MX53 since this one doesn't have a separate clock for internal
RTC but the driver requests one.
Signed-off-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-imx/clk-imx51-imx53.c

@@ -466,6 +466,7 @@ int __init mx53_clocks_init(unsigned long rate_ckil, unsigned long rate_osc,
 	clk_register_clkdev(clk[can1_serial_gate], "per", "53fc8000.can");
 	clk_register_clkdev(clk[can2_ipg_gate], "ipg", "53fcc000.can");
 	clk_register_clkdev(clk[can2_serial_gate], "per", "53fcc000.can");
+	clk_register_clkdev(clk[dummy], NULL, "53fa4000.rtc");
 
 	/* set SDHC root clock to 200MHZ*/
 	clk_set_rate(clk[esdhc_a_podf], 200000000);