Convert CONFIG_OMAP_EHCI_PHY1_RESET_GPIO et al to Kconfig

This converts the following to Kconfig:
   CONFIG_OMAP_EHCI_PHY1_RESET_GPIO
   CONFIG_OMAP_EHCI_PHY2_RESET_GPIO
   CONFIG_OMAP_EHCI_PHY3_RESET_GPIO

To do this, we also introduce CONFIG_HAS_CONFIG_OMAP_EHCI_PHYn_RESET_GPIO
options to get setting the GPIO number.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/omap5_uevm_defconfig b/configs/omap5_uevm_defconfig
index 0436463..0280b4a 100644
--- a/configs/omap5_uevm_defconfig
+++ b/configs/omap5_uevm_defconfig
@@ -49,6 +49,10 @@
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y
+CONFIG_HAS_OMAP_EHCI_PHY2_RESET_GPIO=y
+CONFIG_OMAP_EHCI_PHY2_RESET_GPIO=80
+CONFIG_HAS_OMAP_EHCI_PHY3_RESET_GPIO=y
+CONFIG_OMAP_EHCI_PHY3_RESET_GPIO=79
 CONFIG_USB_DWC3=y
 CONFIG_USB_DWC3_OMAP=y
 CONFIG_USB_DWC3_PHY_OMAP=y