usb: s3c-otg: Split out PHY control

Split the Samsung specific PHY control into a separate file
and compile this into the S3C OTG driver only if used on a
Samsung system.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Vince Bridgers <vbridger@altera.com>
Acked-by: Pavel Machek <pavel@denx.de>
Cc: Stefan Roese <sr@denx.de>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
Tested-by: Lukasz Majewski <l.majewski@samsung.com>
diff --git a/include/configs/smdkv310.h b/include/configs/smdkv310.h
index a2469eb..655025c 100644
--- a/include/configs/smdkv310.h
+++ b/include/configs/smdkv310.h
@@ -14,6 +14,7 @@
 #undef CONFIG_BOARD_COMMON
 #undef CONFIG_USB_GADGET
 #undef CONFIG_USB_GADGET_S3C_UDC_OTG
+#undef CONFIG_USB_GADGET_S3C_UDC_OTG_PHY
 #undef CONFIG_CMD_USB_MASS_STORAGE
 #undef CONFIG_REVISION_TAG
 #undef CONFIG_CMD_THOR_DOWNLOAD