soc/intel/xeon_sp/cpx: Bump MAX_CPUS

Some dual-socket socket systems offer over 100 threads available.
Other multi-socket configurations potentially offer even greater
numbers of CPUs (over 9000!).

Bump MAX_CPUS to 255.

Change-Id: I50a181b89f40777a9f7b3881280c7bacf1b947cb
Signed-off-by: Andrey Petrov <anpetrov@fb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40556
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/xeon_sp/cpx/Kconfig

@@ -28,7 +28,7 @@ config MAX_SOCKET
 
 config MAX_CPUS
 	int
-	default 80
+	default 255
 
 config PCR_BASE_ADDRESS
 	hex