rtc: mxc_rtc: remove cpu_is_xxx by using platform_device_id

It changes the driver to use platform_device_id rather than cpu_is_xxx
to determine the controller type, and updates the platform code
accordingly.

As the result, mach/hardware.h inclusion gets removed from the driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: rtc-linux@googlegroups.com
diff --git a/arch/arm/mach-imx/clk-imx1.c b/arch/arm/mach-imx/clk-imx1.c
index 1982388..1cc7a73 100644
--- a/arch/arm/mach-imx/clk-imx1.c
+++ b/arch/arm/mach-imx/clk-imx1.c
@@ -106,7 +106,7 @@
 	clk_register_clkdev(clk[dummy], "ahb", "imx-fb.0");
 	clk_register_clkdev(clk[hclk], "mshc", NULL);
 	clk_register_clkdev(clk[per3], "ssi", NULL);
-	clk_register_clkdev(clk[clk32], NULL, "mxc_rtc.0");
+	clk_register_clkdev(clk[clk32], NULL, "imx1-rtc.0");
 	clk_register_clkdev(clk[clko], "clko", NULL);
 
 	mxc_timer_init(MX1_IO_ADDRESS(MX1_TIM1_BASE_ADDR), MX1_TIM1_INT);