arm64: renesas: Deduplicate board_early_init_f()

Introduce common weak board_early_init_f() in rcar64-common.c
which is the default implementation in case there is no other
board specific board_early_init_f(). Remove board_early_init_f()
from Salvator-X, ULCB and Draak boards where this function is
empty.

Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
4 files changed