soc/intel/xeon_sp: Set CPU_ADDR_BITS to 46 for SKX and CPX

According to document number 338846 and 336062 this should be set to 46 bits.

Change-Id: I0bbe6c962ffc7d5dc722f1cacf55bc0d0615db59
Signed-off-by: Christian Walter <christian.walter@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45868
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

src/soc/intel/xeon_sp/cpx/Kconfig

@@ -15,6 +15,10 @@ config MAX_CPUS
 	int
 	default 255
 
+config CPU_ADDR_BITS
+	int
+	default 46
+
 config PCR_BASE_ADDRESS
 	hex
 	default 0xfd000000

src/soc/intel/xeon_sp/skx/Kconfig

@@ -15,6 +15,10 @@ config MAX_SOCKET
 	int
 	default 2
 
+config CPU_ADDR_BITS
+	int
+	default 46
+
 # For 2S config, the number of cpus could be as high as
 # 2 threads * 20 cores * 2 sockets
 config MAX_CPUS