mb/gigabyte/ga-b75m-d3h: Drop useless function-disable setting

This bit is already cleared by a reset.

Change-Id: Ib71496011c9621476a7327ba309f367c7fa971e4
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36890
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/mainboard/gigabyte/ga-b75m-d3h/early_init.c

@@ -82,9 +82,3 @@ void mainboard_get_spd(spd_raw_data *spd, bool id_only)
 	read_spd(&spd[2], 0x52, id_only);
 	read_spd(&spd[3], 0x53, id_only);
 }
-
-void mainboard_late_rcba_config(void)
-{
-	/* Enable HECI */
-	RCBA32(FD2) &= ~0x2;
-}