emulation/qemu-q35: Remove redefine TSEG_SZ_MASK

TSEG_SZ_MASK is already defined in "q35.h"

Change-Id: I32ea08c18e1c41d16137ea14a1643f8c8d527722
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83386
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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

@@ -7,8 +7,6 @@
 
 #include "q35.h"
 
-#define TSEG_SZ_MASK	(3 << 1)
-
 void mainboard_romstage_entry(void)
 {
 	i82801ix_early_init();