i.MX27 pca100: Add USB support

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx2/Kconfig b/arch/arm/mach-mx2/Kconfig
index 7bc797c..ca1278d 100644
--- a/arch/arm/mach-mx2/Kconfig
+++ b/arch/arm/mach-mx2/Kconfig
@@ -100,6 +100,7 @@
 config MACH_PCA100
 	bool "Phytec phyCARD-s (pca100)"
 	depends on MACH_MX27
+	select MXC_ULPI if USB_ULPI
 	help
 	  Include support for phyCARD-s (aka pca100) platform. This
 	  includes specific configurations for the module and its peripherals.