board: starfive: DeepComputing FML13V01 fdt selection

board: starfive: DeepComputing FML13V01 fdt selection

We support all JH7110 boards with starfive_visionfive2_defconfig.
The relevant device-tree is selected at runtime based on EEPROM data.

Support setting $fdtfile to the file name of the DeepComputing Framework
motherboard (FML13V01) device-tree.

Reviewed-by: Hal Feng <hal.feng@starfivetech.com>
Reviewed-by: Matthias Brugger <mbrugger@suse.com>
Reviewed-by: E Shattow <e@freeshell.de>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>