Convert CONFIG_AM335X_USB0 et al to Kconfig

This converts the following to Kconfig:
   CONFIG_AM335X_USB0
   CONFIG_AM335X_USB0_MODE
   CONFIG_AM335X_USB1
   CONFIG_AM335X_USB1_MODE

We do this by introducing specific options for static configuration of
USB0/USB1 in SPL rather than defining CONFIG_AM335X_USBx_MODE to the
enum value being used.  Furthermore, with how the code is used now we do
not need to have OTG mode exposed as an option here, so remove that.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-omap2/am33xx/Kconfig b/arch/arm/mach-omap2/am33xx/Kconfig
index 1402376..b8e115d 100644
--- a/arch/arm/mach-omap2/am33xx/Kconfig
+++ b/arch/arm/mach-omap2/am33xx/Kconfig
@@ -280,3 +280,35 @@
 	  image, this area is no longer used, and can be reclaimed
 	  for run time use by the boot image.
 endif
+
+config AM335X_USB0
+	bool "Static mode configuration for USB0 in SPL"
+	depends on AM33XX && SPL_MUSB_NEW && !SPL_OF_CONTROL
+
+choice
+	prompt "USB0 port configuration"
+	depends on AM335X_USB0
+
+config AM335X_USB0_HOST
+	bool "Port is used in host mode"
+
+config AM335X_USB0_PERIPHERAL
+	bool "Port is used in peripheral mode"
+
+endchoice
+
+config AM335X_USB1
+	bool "Static mode configuration for USB1 in SPL"
+	depends on AM33XX && SPL_MUSB_NEW && !SPL_OF_CONTROL
+
+choice
+	prompt "USB1 port configuration"
+	depends on AM335X_USB1
+
+config AM335X_USB1_HOST
+	bool "Port is used in host mode"
+
+config AM335X_USB1_PERIPHERAL
+	bool "Port is used in peripheral mode"
+
+endchoice