Define SX126X_ANT_SW for the RAK11200 on the RAK19007 base

[RealityAnomaly]

Fixes #3338, allows the RAK13300 and GNSS module to function correctly when used on the RAK19007 base with the RAK11200 core module by activating the 3.3V power rail correctly.

[CLAassistant]

All committers have signed the CLA.

[S5NC]

On this board the name is very misleading, SX126X_ANT_SW on this board is not acting to "make analog PA vs not PA switch on SX126x eval board work properly" but to act as a pull-up for a reason unrelated to antenna switching. pca10056-rc-clock uses it for SX1262MB2CAS which acts as the other input to the RF switching IC, the other one being DIO2. Other boards typically hardware invert DIO2 and feed it to that RF switch input. This comment is wrong, as the only board where SX126X_ANT_SW is uncommented (excluding this new addition) doesn't use it for exactly that purpose.

[S5NC]

Haha, #define SX126X_POWER_EN WB_IO3 and #define SX126X_ANT_SW WB_IO2 are switched but have the same effect

[S5NC]

Maybe on another base board WB_IO3 is really the SX126X's power switch?

[S5NC]

RAK5005 also uses IO2 to enable 3V3_S

30 IO2 I/O Used for 3V3_S enable

[S5NC]

@thebentern what other base boards can carry the RAK11200 and did they work before this change?

[thebentern]

At one time, the legacy RAK-5005 base boards worked, but I have not tested that configuration in quite some time.

[S5NC]

https://github.com/meshtastic/firmware/blame/master/variants/rak11200/variant.h#L78 done by #1947, I can also see how RF switching evolved in that PR too!

[S5NC]

At one time, the legacy RAK-5005 base boards worked, but I have not tested that configuration in quite some time.

I suspect if all Wisblock IO (not sensor) connectors are the same, this should create no new issues and potentially fix use with the other boards too