nb/intel/nehalem/gma: Drop stale pre-pocessor guards

These were forgotten when updating the caller and resulted in build
failures for every but the NGI path.

Change-Id: I2490a3b4dca6c248eb37f43aa676ae619afdbfc7
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/22930
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/northbridge/intel/nehalem/gma.c

@@ -572,8 +572,6 @@ static void gma_pm_init_post_vbios(struct device *dev)
 	}
 }
 
-#if IS_ENABLED(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT)
-
 static void train_link(u8 *mmio)
 {
 	/* Clear interrupts. */
@@ -1009,8 +1007,6 @@ static void intel_gma_init(const struct northbridge_intel_nehalem_config *info,
 	}
 }
 
-#endif
-
 /* Enable SCI to ACPI _GPE._L06 */
 static void gma_enable_swsci(void)
 {