paclage/genpart: change homepage and download location

The old homepage is no more, and the download location has changed.
Update both to the new download location.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/genpart/Config.in

@@ -5,4 +5,4 @@ config BR2_PACKAGE_GENPART
 	  line arguments and dump it to stdout. No CHS magic is done,
 	  only lba entries are filled out.
 
-	  http://www.pengutronix.de/software/genpart/index_en.html
+	  https://public.pengutronix.de/software/genpart

package/genpart/Config.in.host

@@ -5,4 +5,4 @@ config BR2_PACKAGE_HOST_GENPART
 	  line arguments and dump it to stdout. No CHS magic is done,
 	  only lba entries are filled out.
 
-	  http://www.pengutronix.de/software/genpart/index_en.html
+	  https://public.pengutronix.de/software/genpart

package/genpart/genpart.mk

@@ -6,7 +6,7 @@
 
 GENPART_VERSION = 1.0.2
 GENPART_SOURCE = genpart-$(GENPART_VERSION).tar.bz2
-GENPART_SITE = http://www.pengutronix.de/software/genpart/download
+GENPART_SITE = https://public.pengutronix.de/software/genpart
 # genpart has no license embedded in its source release.
 # However, their project page mentions:
 #   > This community portal offers an overview about our own OSS