omap3: Migrate CONFIG_OMAP3_GPIO_X to Kconfig

The symbols CONFIG_OMAP3_GPIO_X control if we enable the clocks for a
given GPIO bank in U-Boot.  select the required banks for each target.
In some cases we need to also migrate from CONFIG_USB_EHCI (deprecated,
in include/configs/) to CONFIG_USB_EHCI_HCD as we only require the GPIO
bank to be enabled if USB is also enabled.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/twister_defconfig b/configs/twister_defconfig
index ba7b68b..62d7d17 100644
--- a/configs/twister_defconfig
+++ b/configs/twister_defconfig
@@ -26,6 +26,7 @@
 CONFIG_MMC_OMAP_HS=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
+CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_ULPI_VIEWPORT_OMAP=y
 CONFIG_USB_ULPI=y
 CONFIG_USB_STORAGE=y