package/flashbench: update the upstream URL in Config.in

Update the upstream URL in the help text in Config.in. This
addresses the 'Invalid(404)' 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/flashbench/Config.in

@@ -7,4 +7,4 @@ config BR2_PACKAGE_FLASHBENCH
 	  SD cards and other media for the Linaro flash memory
 	  survey.
 
-	  https://wiki.linaro.org/WorkingGroups/KernelConsolidation/Projects/FlashCardSurvey
+	  https://git.linaro.org/people/arnd.bergmann/flashbench.git