ARM: imx: let MACH_IMX27_VISSTRIM_M10 select IMX_HAVE_PLATFORM_IMX_SSI

mach-imx27_visstrim_m10.c uses imx27_add_imx_ssi() so it needs to select
IMX_HAVE_PLATFORM_IMX_SSI to fix:

	arch/arm/mach-imx/built-in.o: In function `visstrim_m10_board_init':
	mach-imx27_visstrim_m10.c:(.init.text+0x308): undefined reference to `imx_add_imx_ssi'
	mach-imx27_visstrim_m10.c:(.init.text+0x394): undefined reference to `imx27_imx_ssi_data'

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-imx/Kconfig

@@ -255,6 +255,7 @@ config MACH_IMX27_VISSTRIM_M10
 	bool "Vista Silicon i.MX27 Visstrim_m10"
 	select SOC_IMX27
 	select IMX_HAVE_PLATFORM_IMX_I2C
+	select IMX_HAVE_PLATFORM_IMX_SSI
 	select IMX_HAVE_PLATFORM_IMX_UART
 	select IMX_HAVE_PLATFORM_MXC_MMC
 	select IMX_HAVE_PLATFORM_MXC_EHCI