soc/intel/xeon_sp/cpx: Remove redundant declaration

The declaration is autogenerated inside static.c file
from the pathname.

Change-Id: I6eda101a69522d6d526da7c174aa3085ca0fb221
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41709
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/xeon_sp/cpx/chip.h

@@ -17,8 +17,6 @@ struct soc_intel_xeon_sp_cpx_config {
 	uint32_t gen4_dec;
 };
 
-extern struct chip_operations soc_intel_xeon_sp_cpx_ops;
-
 typedef struct soc_intel_xeon_sp_cpx_config config_t;
 
 #endif