ARM: imx: dynamically allocate mxc_w1 devices

Currently there is no platform data used in the driver.  In case this
changes NULL is passed unused to the soc specific functions.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 197f9e2..edf0182 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -88,6 +88,7 @@
 	select IMX_HAVE_PLATFORM_IMX_I2C
 	select IMX_HAVE_PLATFORM_IMX_UART
 	select IMX_HAVE_PLATFORM_MXC_NAND
+	select IMX_HAVE_PLATFORM_MXC_W1
 	help
 	  Include support for MX27ADS platform. This includes specific
 	  configurations for the board and its peripherals.
@@ -97,6 +98,7 @@
 	select IMX_HAVE_PLATFORM_IMX_I2C
 	select IMX_HAVE_PLATFORM_IMX_UART
 	select IMX_HAVE_PLATFORM_MXC_NAND
+	select IMX_HAVE_PLATFORM_MXC_W1
 	select IMX_HAVE_PLATFORM_SPI_IMX
 	select MXC_ULPI if USB_ULPI
 	help
@@ -122,6 +124,7 @@
 	select IMX_HAVE_PLATFORM_IMX_I2C
 	select IMX_HAVE_PLATFORM_IMX_UART
 	select IMX_HAVE_PLATFORM_MXC_NAND
+	select IMX_HAVE_PLATFORM_MXC_W1
 	select MXC_ULPI if USB_ULPI
 	help
 	  Include support for Eukrea CPUIMX27 platform. This includes
@@ -186,6 +189,7 @@
 	select IMX_HAVE_PLATFORM_IMX_SSI
 	select IMX_HAVE_PLATFORM_IMX_UART
 	select IMX_HAVE_PLATFORM_MXC_NAND
+	select IMX_HAVE_PLATFORM_MXC_W1
 	select IMX_HAVE_PLATFORM_SPI_IMX
 	select MXC_ULPI if USB_ULPI
 	help