The latest Beagle kernel has some support now for the BeagleY-AI, update
the current branch to this version. This also allows us to re-use the
default linux-k3-beagle-current.conf as our LINUXCONFIG. This was set
to re-use the TI kernel before which was incorrect.
As BOOTPATCHDIR is based on LINUXFAMILY we should also keep our Beagle
U-Boot versions in sync, the latest Beagle U-Boot for pocketbeagle2
supports BeagleY-AI also, so switch to that.
Signed-off-by: Andrew Davis <afd@ti.com>