soc: qcom: smem: update max processor count

Update max processor count to reflect the number of co-processors on
SA8775P SoCs.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Eric Chanudet <echanude@redhat.com>
Tested-by: Eric Chanudet <echanude@redhat.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230209095753.447347-2-brgl@bgdev.pl

drivers/soc/qcom/smem.c

@@ -85,7 +85,7 @@
 #define SMEM_GLOBAL_HOST	0xfffe
 
 /* Max number of processors/hosts in a system */
-#define SMEM_HOST_COUNT		15
+#define SMEM_HOST_COUNT		20
 
 /**
   * struct smem_proc_comm - proc_comm communication struct (legacy)