usb: dwc2: Rename CONFIG_DWC2_UTMI_PHY_WIDTH to CONFIG_DWC2_UTMI_WIDTH

For some reason from day one we used to have both CONFIG_DWC2_UTMI_WIDTH
mentioned in dwc2.h and in scripts/config_whitelist.txt but never really used
and CONFIG_DWC2_UTMI_PHY_WIDTH used in real code in dwc2.c (but never
defined).

Moreover even though CONFIG_DWC2_UTMI_WIDTH might be either 8 or 16
depending on hardware (and the same is said in a comment for it in
dwc2.h) but then 8 is hardcoded in the header leaving no ability to
override this value in board's configuration.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Marek Vasut <marex@denx.de>

drivers/usb/host/dwc2.c

@@ -375,7 +375,7 @@ static void dwc_otg_core_init(struct dwc2_priv *priv)
 		usbcfg &= ~DWC2_GUSBCFG_DDRSEL;
 #endif
 	} else {	/* UTMI+ interface */
-#if (CONFIG_DWC2_UTMI_PHY_WIDTH == 16)
+#if (CONFIG_DWC2_UTMI_WIDTH == 16)
 		usbcfg |= DWC2_GUSBCFG_PHYIF;
 #endif
 	}

drivers/usb/host/dwc2.h

@@ -775,7 +775,9 @@ struct dwc2_core_regs {
 #define DWC2_PHY_TYPE_UTMI		1
 #define DWC2_PHY_TYPE_ULPI		2
 #define CONFIG_DWC2_PHY_TYPE		DWC2_PHY_TYPE_UTMI	/* PHY type */
+#ifndef CONFIG_DWC2_UTMI_WIDTH
 #define CONFIG_DWC2_UTMI_WIDTH		8	/* UTMI bus width (8/16) */
+#endif
 
 #undef CONFIG_DWC2_PHY_ULPI_DDR			/* ULPI PHY uses DDR mode */
 #define CONFIG_DWC2_PHY_ULPI_EXT_VBUS		/* ULPI PHY controls VBUS */