package/devmem2: Fix DEVMEM2_SITE variable

The old free-electrons.com URL does not seem to work anymore,
resulting in the package failing to build. Use bootlin.com instead.

Signed-off-by: Xavier Ruppen <xruppen@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 408b48b5c58e478a615e50f94989576c133ea8d1)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/devmem2/Config.in

@@ -4,4 +4,4 @@ config BR2_PACKAGE_DEVMEM2
 	help
 	  Simple program to read/write from/to any location in memory.
 
-	  http://free-electrons.com/pub/mirror/devmem2.c
+	  http://bootlin.com/pub/mirror/devmem2.c

package/devmem2/devmem2.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-DEVMEM2_SITE = http://free-electrons.com/pub/mirror
+DEVMEM2_SITE = http://bootlin.com/pub/mirror
 DEVMEM2_SOURCE = devmem2.c
 DEVMEM2_VERSION = 1
 DEVMEM2_LICENSE = GPL-2.0+