i2c: imx: remove cpu_is_xxx by using platform_device_id

This is some amount of work left/forgot from device tree conversion.
Instead of checking cpu_is_xxx to determine the controller type, the
driver should use platform_device_id, which should match the device
tree compatible string.

The patch changes the driver to use platform_device_id rather than
cpu_is_xxx to determine the controller type/version.  It also updates
the platform code and device tree source 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: Wolfram Sang <w.sang@pengutronix.de>
Cc: linux-i2c@vger.kernel.org
diff --git a/arch/arm/mach-imx/clk-imx27.c b/arch/arm/mach-imx/clk-imx27.c
index 31010cb..c2f111f 100644
--- a/arch/arm/mach-imx/clk-imx27.c
+++ b/arch/arm/mach-imx/clk-imx27.c
@@ -247,8 +247,8 @@
 	clk_register_clkdev(clk[fec_ipg_gate], "ipg", "imx27-fec.0");
 	clk_register_clkdev(clk[fec_ahb_gate], "ahb", "imx27-fec.0");
 	clk_register_clkdev(clk[wdog_ipg_gate], NULL, "imx2-wdt.0");
-	clk_register_clkdev(clk[i2c1_ipg_gate], NULL, "imx-i2c.0");
-	clk_register_clkdev(clk[i2c2_ipg_gate], NULL, "imx-i2c.1");
+	clk_register_clkdev(clk[i2c1_ipg_gate], NULL, "imx21-i2c.0");
+	clk_register_clkdev(clk[i2c2_ipg_gate], NULL, "imx21-i2c.1");
 	clk_register_clkdev(clk[owire_ipg_gate], NULL, "mxc_w1.0");
 	clk_register_clkdev(clk[kpp_ipg_gate], NULL, "imx-keypad");
 	clk_register_clkdev(clk[emma_ahb_gate], "emma-ahb", "mx2-camera.0");