SPRACINGF3NEO - Use RTC6705 clk hack.

CF/BF - Fix typo in max7456DmaInProgress.  Always define an
implementation even when there is no TX-DMA.

CF/BF - Ensure that max7456 communication does not disrupt RTC6705
communication when using the same SPI port for both.

CF/BF - Port RTC6705 to use the VTX API.

* Support VTX channel/band/power on OSD for ALL vtx APIs - previously it only supported RTC6705.
* Remove all FEATURE_VTX usage.
* Remove all `#define VTX` usage.

Note that due to the async nature of tramp/smartaudio it's not possible
to know the current band/channel after requesting a change (as the
request hasn't been processed) so it makes no sense to try and save the
config - and on the tramp/smartaudio vtx the vtx maintains it's state.
So on an RTX6705 equipped FC the user should now MANUALLY save the
config using the save config stick position.

CF/BF - Move CMS for RTC6705 into vtx_rtc6705.c for consistency with
other VTX CMS menus.

CF/BF - Update RTC6705 via SOFT SPI to use VTX API.

* Achieved by simply aligning the API at the driver level and removing
all legacy conditional compilation checks.

CF/BF - Use new IO for RTC6705 CLK Hack

CF/BF - Port VTX button from CF v1.x.

Features:
* Channel Cycle
* Band Cycle
* Power Cycle
* Save Settings
* Works with any VTX using VTX API.

CF/BF - Allow support for Internal and External VTX - External takes
precedence when configured.

CF/BF - Fix display of VTX power in CMS.

* Issue occured when CMS was transitioned from integer to list of
strings.

CF/BF - Disable SMARTAUDIO and TRAMP on the SPRacingF3NEO due to flash
size.

CF/BF - Cleanup const usage of bass-by-value parameters.  Cleanup
naming.

CF/BF - Cleanup naming.  Removing noise-words. Improving consistency.

CF/BF - Improve readability by further naming cleanups.

CF/BF - Remove some magic numbers in the RTC6705 VTX code.

CF/BF - Use braces on some procedural macros.

CF/BF - Improve code readability by renaming rtc6705SetChannel to
rtc6705SetBandAndChannel.

CF/BF - Remove editor mishap.

CF/BF - Make the rtc6705Dev variable static.

CF/BF - remove duplicate state variablertc6705Dev_t - vtxDevice_t had
all we needed.  Use brackets on some procedural style macros.  Make all
the vtx vtable static const.

CF/BF - making some declarations const.

CF/BF - Fix vtx_power maximum value (out by one).

src/main/fc/rc_controls.c

@@ -45,7 +45,7 @@
 #include "io/gps.h"
 #include "io/beeper.h"
 #include "io/motors.h"
-#include "io/vtx.h"
+#include "io/vtx_control.h"
 #include "io/dashboard.h"
 
 #include "sensors/barometer.h"
@@ -60,7 +60,6 @@
 #include "flight/navigation.h"
 #include "flight/failsafe.h"
 
-
 static pidProfile_t *pidProfile;
 
 // true if arming is done via the sticks (as opposed to a switch)
@@ -294,7 +293,7 @@ void processRcStickPositions(throttleStatus_e throttleStatus)
     }
 #endif
 
-#ifdef VTX
+#ifdef VTX_CONTROL
     if (rcSticks ==  THR_HI + YAW_LO + PIT_CE + ROL_HI) {
         vtxIncrementBand();
     }