board: xen: Remove unnecessary CONFIG_BOARD_EARLY_INIT_F define and board_early_init_f function

Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

board/xen/xenguest_arm64/xenguest_arm64.c

@@ -184,11 +184,6 @@ int ft_board_setup(void *blob, struct bd_info *bd)
 	return 0;
 }
 
-int board_early_init_f(void)
-{
-	return 0;
-}
-
 int print_cpuinfo(void)
 {
 	printf("Xen virtual CPU\n");