Make SPI frequency and TOPHONE queue size configurable on Native (#4369)

* Make SPI frequency configurable on Native

* Make the tophone queue size configurable for Portduino

* The modified SPISettings must be configured in setup(), after config.yaml is processed

* make MeshService a pointer, so we can configure MAX_RX_TOPHONE at run time

* Got a little over excited with refactoring

* Silence a warning

src/platform/portduino/PortduinoGlue.h

@@ -19,6 +19,7 @@ enum configNames {
     user,
     gpiochip,
     spidev,
+    spiSpeed,
     i2cdev,
     has_gps,
     touchscreenModule,
@@ -51,6 +52,7 @@ enum configNames {
     webserver,
     webserverport,
     webserverrootpath,
+    maxtophone,
     maxnodes
 };
 enum { no_screen, x11, st7789, st7735, st7735s, st7796, ili9341, ili9488, hx8357d };