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/soc/intel/quark/chip.h

@@ -113,6 +113,4 @@ struct soc_intel_quark_config {
 	uint8_t  SmmTsegSize;   /* SMM size in MiB */
 };
 
-extern struct chip_operations soc_ops;
-
 #endif