usb: dwc3: exynos: remove non-DT support for Exynos Specific Glue layer

DWC3 Exynos Specific Glue layer can be used only for Exynos SoCs.
In addition, non-DT for EXYNOS SoCs is not supported from v3.11;
thus, there is no need to support non-DT for DWC3 Exynos Specific
Glue layer.

The 'linux/platform_data/dwc3-exynos.h' file has been used for
non-DT support. Thus, the 'dwc3-exynos.h' file is removed, because
it is not used anymore.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index f4e5cc6..58b5b2c 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -55,7 +55,7 @@
 
 config USB_DWC3_EXYNOS
 	tristate "Samsung Exynos Platform"
-	depends on ARCH_EXYNOS || COMPILE_TEST
+	depends on ARCH_EXYNOS && OF || COMPILE_TEST
 	default USB_DWC3
 	help
 	  Recent Exynos5 SoCs ship with one DesignWare Core USB3 IP inside,