staging: dwc2: remove compile warning for USB_DWC2_TRACK_MISSED_SOFS

Remove the compile-time warning for this config option, and instead
warn that it is experimental in the Kconfig text

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dwc2/Kconfig

@@ -39,6 +39,7 @@ config USB_DWC2_TRACK_MISSED_SOFS
 	bool "Enable Missed SOF Tracking"
 	help
 	  Say Y here to enable logging of missed SOF events to the dmesg log.
+	  WARNING: This feature is still experimental.
 	  If in doubt, say N.
 
 config USB_DWC2_DEBUG_PERIODIC

drivers/staging/dwc2/hcd_intr.c

@@ -56,8 +56,6 @@
 static void dwc2_track_missed_sofs(struct dwc2_hsotg *hsotg)
 {
 #ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
-#warning Compiling code to track missed SOFs
-
 	u16 curr_frame_number = hsotg->frame_number;
 
 	if (hsotg->frame_num_idx < FRAME_NUM_ARRAY_SIZE) {