cpu/x86/Kconfig: Remove unused CPU_ADDR_BITS

Change-Id: I88f62c18b814ac0ddd356944359e727d6e3bba5a
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58688
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Mariusz Szafrański <mariuszx.szafranski@intel.com>

src/cpu/intel/model_106cx/Kconfig

@@ -11,11 +11,3 @@ config CPU_INTEL_MODEL_106CX
 	select SERIALIZED_SMM_INITIALIZATION
 	select CPU_INTEL_COMMON
 	select CPU_INTEL_COMMON_TIMEBASE
-
-if CPU_INTEL_MODEL_106CX
-
-config CPU_ADDR_BITS
-	int
-	default 32
-
-endif