arm: omap4: select USB_ARCH_HAS_EHCI

The OMAP4 has an on-chip EHCI controller. Select USB_ARCH_HAS_EHCI
to allow the EHCI driver to be built on OMAP4.
Signed-off-by: NAnand Gadiyar <gadiyar@ti.com>
Acked-by: NTony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/Kconfig

@@ -44,6 +44,7 @@ config ARCH_OMAP4
 	select ARM_GIC
 	select PL310_ERRATA_588369
 	select ARM_ERRATA_720789
+	select USB_ARCH_HAS_EHCI
 
 comment "OMAP Core Type"
 	depends on ARCH_OMAP2