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/x86/Kconfig

@@ -90,10 +90,6 @@ config SETUP_XIP_CACHE
 	  non-eviction mode and therefore need to be careful to avoid
 	  eviction.
 
-config CPU_ADDR_BITS
-	int
-	default 36
-
 config LOGICAL_CPUS
 	bool
 	default y