cpu/intel/model_2065x: Drop unused function declaration

Looks like the `set_power_limits()` declaration is copy-pasta leftovers
from `cpu/intel/model_206ax`. As it's unused, get rid of it.

Change-Id: I81704e883e52fea42488f52be116b6fcc2c6af4b
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64046
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/cpu/intel/model_2065x/model_2065x.h

@@ -53,9 +53,6 @@
 /* Lock MSRs */
 void intel_model_2065x_finalize_smm(void);
 
-/* Configure power limits for turbo mode */
-void set_power_limits(u8 power_limit_1_time);
-
 /* Sanity check config options. */
 #if (CONFIG_SMM_TSEG_SIZE <= CONFIG_SMM_RESERVED_SIZE)
 # error "CONFIG_SMM_TSEG_SIZE <= CONFIG_SMM_RESERVED_SIZE"