configs: Use HTTPS URL for Github repos

This makes it possible to clone git repositories hosted on Github while
behind a firewall.

Signed-off-by: Paul Cercueil <paul.cercueil@analog.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
diff --git a/configs/atmel_sama5d3_xplained_defconfig b/configs/atmel_sama5d3_xplained_defconfig
index 4eb5304..480f2fd 100644
--- a/configs/atmel_sama5d3_xplained_defconfig
+++ b/configs/atmel_sama5d3_xplained_defconfig
@@ -22,7 +22,7 @@
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
 BR2_TARGET_UBOOT_CUSTOM_GIT=y
-BR2_TARGET_UBOOT_CUSTOM_REPO_URL="git://github.com/linux4sam/u-boot-at91.git"
+BR2_TARGET_UBOOT_CUSTOM_REPO_URL="https://github.com/linux4sam/u-boot-at91.git"
 BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION="linux4sam_5.3"
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="sama5d3_xplained_nandflash"
 BR2_PACKAGE_HOST_SAM_BA=y