devicetree: Remove duplicate chip_ops declarations

These are only referenced inside auto-generated static.c
files, and util/sconfig also generates the declarations
automatically from source file pathnames.

Change-Id: Id324790755095c36fbeb73a4d8f9d01cdf6409cb
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34979
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/intel/haswell/chip.h

@@ -13,8 +13,6 @@
  * GNU General Public License for more details.
  */
 
-extern struct chip_operations cpu_intel_haswell_ops;
-
 /* Magic value used to locate this chip in the device tree */
 #define SPEEDSTEP_APIC_MAGIC 0xACAC