nb/intel/haswell: Drop unused function declaration

Change-Id: Ica612bcdac373ac013a877bb96b77b2a3f522f7f
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50540
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/haswell/raminit.h

@@ -18,7 +18,7 @@ void mb_get_spd_map(uint8_t spd_map[4]);
 
 void sdram_initialize(struct pei_data *pei_data);
 void setup_sdram_meminfo(struct pei_data *pei_data);
-int fixup_haswell_errata(void);
+
 /* save_mrc_data() must be called after cbmem has been initialized. */
 void save_mrc_data(struct pei_data *pei_data);