U-Boot 2018.05 and later will attempt to load a dtb for PocketBeagle if

U-Boot 2018.05 and later will attempt to load a dtb for PocketBeagle if
the hardware is detected.  Add this to the miniroot/ramdisk.
requires dtb 4.18

U-Boot 2018.09 and later will load a dtb for 'SanCloud BeagleBone
Enhanced' if required which will be in dtb 4.19 after linux 4.19 is
released and can be added then.