TFT branch grab-bag (#5683)

Selection of minor edits from the TFT branch that are too
challenging to cherry-pick cleanly, including:
* introducing the HAS_TFT flag
* fixing pins in unphone
* Adding pinterdevice to portduino settings

src/graphics/Screen.cpp

@@ -1718,7 +1718,7 @@ void Screen::setup()
 #endif
     serialSinceMsec = millis();
 
-#if ARCH_PORTDUINO
+#if ARCH_PORTDUINO && !HAS_TFT
     if (settingsMap[touchscreenModule]) {
         touchScreenImpl1 =
             new TouchScreenImpl1(dispdev->getWidth(), dispdev->getHeight(), static_cast<TFTDisplay *>(dispdev)->getTouch);

src/graphics/TFTDisplay.cpp

@@ -347,7 +347,7 @@ static LGFX *tft = nullptr;
 #include <TFT_eSPI.h> // Graphics and font library for ILI9342 driver chip
 
 static TFT_eSPI *tft = nullptr; // Invoke library, pins defined in User_Setup.h
-#elif ARCH_PORTDUINO && HAS_SCREEN != 0
+#elif ARCH_PORTDUINO && HAS_SCREEN != 0 && !HAS_TFT
 #include <LovyanGFX.hpp> // Graphics and font library for ST7735 driver chip
 
 class LGFX : public lgfx::LGFX_Device