Fix Ublox M10 Setup (#4842)

There is no EXTINT pin available on the Tdeck, which uses
the Ublox M10 GPS. Therefore our previous hack to use that pin
makes the GPS not work. That workaround was implemented to
fix sleep issues which have now since been fixed with the
state machine.

This patch restores the state prior to the hack, which is
known-working.

Additionaly, it was discovered that M10s hate it when you
try and save to non-extistent eeprom/SPI flash.

This patch creates a new SAVE command for the M10 that fixes
this issue.

Many thanks to @MisterC925 whose report and testing was
essential for this fix.

fixes https://github.com/meshtastic/firmware/issues/4625

Co-authored-by: Ken McGuire <kenm@paonia.com>

src/gps/GPS.h

@@ -134,6 +134,7 @@ class GPS : private concurrency::OSThread
     static const uint8_t _message_GGA[];
     static const uint8_t _message_PMS[];
     static const uint8_t _message_SAVE[];
+    static const uint8_t _message_SAVE_10[];
 
     // VALSET Commands for M10
     static const uint8_t _message_VALSET_PM[];