Migrate NRF52 devices max nodes down to 80 for now to prevent brownouts (#5346)

src/mesh/mesh-pb-constants.h

@@ -1,6 +1,7 @@
 #pragma once
 #include <vector>
 
+#include "architecture.h"
 #include "mesh/generated/meshtastic/admin.pb.h"
 #include "mesh/generated/meshtastic/deviceonly.pb.h"
 #include "mesh/generated/meshtastic/localonly.pb.h"
@@ -20,8 +21,14 @@
 
 /// max number of nodes allowed in the mesh
 #ifndef MAX_NUM_NODES
+#ifdef ARCH_NRF52
+#define MAX_NUM_NODES 80
+#else
 #define MAX_NUM_NODES 100
 #endif
+#endif
+
+#define MAX_NUM_NODES_FS 100
 
 /// Max number of channels allowed
 #define MAX_NUM_CHANNELS (member_size(meshtastic_ChannelFile, channels) / member_size(meshtastic_ChannelFile, channels[0]))