increasing number of msp ports (betaflight#14263)

* increasing number of msp ports

* Adding custom define and bumping to 6 ports

* reverting msp ports to allow to be bumped at build time

* Update src/main/msp/msp_serial.h

Co-authored-by: Mark Haslinghuis <[email protected]>

* reset src/config

---------

Co-authored-by: nerdCopter <[email protected]>
Co-authored-by: Mark Haslinghuis <[email protected]>

Author: 3 people

src/main/msp/msp_serial.h

@@ -27,7 +27,9 @@
 #include "msp/msp.h"
 
 // Each MSP port requires state and a receive buffer, revisit this default if someone needs more than 3 MSP ports.
+#ifndef MAX_MSP_PORT_COUNT
 #define MAX_MSP_PORT_COUNT 3
+#endif
 
 typedef enum {
     PORT_IDLE,