mtd: mxc_nand: 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: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: linux-mtd@lists.infradead.org

arch/arm/mach-imx/clk-imx31.c

@@ -127,7 +127,7 @@ int __init mx31_clocks_init(unsigned long fref)
 	clk_register_clkdev(clk[rtc_gate], NULL, "mxc_rtc");
 	clk_register_clkdev(clk[epit1_gate], "epit", NULL);
 	clk_register_clkdev(clk[epit2_gate], "epit", NULL);
-	clk_register_clkdev(clk[nfc], NULL, "mxc_nand.0");
+	clk_register_clkdev(clk[nfc], NULL, "imx27-nand.0");
 	clk_register_clkdev(clk[ipu_gate], NULL, "ipu-core");
 	clk_register_clkdev(clk[ipu_gate], NULL, "mx3_sdc_fb");
 	clk_register_clkdev(clk[kpp_gate], NULL, "imx-keypad");