Re-introduced rock64_defconfig which was dropped by commit
a5fa2469e6 ('Revert
"configs/rock64_defconfig: remove defconfig"').
Signed-off-by: Min Xu <xuminready@gmail.com>
Tested-by: Michał Łyszczek <michal.lyszczek@bofc.pl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>