soc/amd/genoa: Add MAX_CPUS

As per PPR, Genoa supports up to 96 core, that is 192 threads.
It also supports dual socket.

Change-Id: I817fea7c41477f476794e9e5c16451037d01f912
Signed-off-by: Varshit Pandya <pandyavarshit@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78402
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>

src/soc/amd/genoa/Kconfig

@@ -44,6 +44,10 @@ config EARLYRAM_BSP_STACK_SIZE
 	hex
 	default 0x1000
 
+config MAX_CPUS
+	int
+	default 384
+
 config PSP_APOB_DRAM_ADDRESS
 	hex
 	default 0x7001000