package/mali-t76x: update the upstream URL in Config.in

Update the upstream URL in the help text in Config.in. Removing
the text from the beginning of the URL line addresses the 'Missing'
URL status in the package stats web page output.

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/mali-t76x/Config.in

@@ -11,7 +11,7 @@ config BR2_PACKAGE_MALI_T76X
 	  Midgard T76X GPU. This package requires a kernel with the
 	  ARM Mali Midgard GPU Kernel Drivers enabled.
 
-	  Source: http://malideveloper.arm.com/resources/drivers/
+	  http://malideveloper.arm.com/resources/drivers/
 
 if BR2_PACKAGE_MALI_T76X