[PATCH 2/7] usb: s3c-hsotg: Move s3c-hsotg into dwc2 folder

From: Dinh Nguyen <dinguyen@xxxxxxxxxx>

Moves the s3c-hsotg driver into the dwc2 folder and use the dwc2 defines in
hw.h. The s3c-hostg driver will now be built with a kconfig option under
the dwc2 kconfig. USB_DWC2_HOST and USB_S3C_HSOTG are mutually exclusive
build options.