configs/beaglebone: use the new BeagleBoard/BeagleBone kernel repository

The original source URL (http://beagleboard.org/source) now redirects to
https://elinux.org/Beagleboard:BeagleBoneBlack_Rebuilding_Software_Image
which points to an official kernel repository at GitHub.

There are updated RT and non-RT kernel source trees. Use the last non-RT
release (4.19.73-ti-r29) and the omap2plus defconfig.

Signed-off-by: Carlos Santos <unixmania@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/beaglebone_defconfig

@@ -7,8 +7,8 @@ BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
 BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/beaglebone/genimage.cfg"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_GIT=y
-BR2_LINUX_KERNEL_CUSTOM_REPO_URL="git://git.ti.com/processor-sdk/processor-sdk-linux.git"
-BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="4dae378bbe721277b08699d1d88ffae12acc9b09"
+BR2_LINUX_KERNEL_CUSTOM_REPO_URL="git://github.com/beagleboard/linux.git"
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="4.19.73-ti-r29"
 BR2_LINUX_KERNEL_DEFCONFIG="omap2plus"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="am335x-evm am335x-bone am335x-boneblack am335x-bonegreen am335x-evmsk am335x-boneblue"