sb/intel: Use common RCBA MACROs

This commit follows up on commit 2e464cf3 with Change-Id
I61fb3b01ff15ba2da2ee938addfa630c282c9870.

Change-Id: Iaf06d347e2da5680816b17f49523ac1a687798ba
Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Reviewed-on: https://review.coreboot.org/c/29236
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: David Guckian
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/mainboard/emulation/qemu-q35/bootblock.c

@@ -59,7 +59,7 @@ static void bootblock_southbridge_init(void)
 	enable_spi_prefetch();
 
 	/* Enable RCBA */
-	pci_write_config32(PCI_DEV(0, 0x1f, 0), D31F0_RCBA,
+	pci_write_config32(PCI_DEV(0, 0x1f, 0), RCBA,
 			(uintptr_t)DEFAULT_RCBA | 1);
 }