Plain RAK4631 should not compile EInk and TFT display code (#8811)

* Plain RAK4631 should not compile EInk and TFT display code

* Add USE_TFTDISPLAY to variant files.

* Derp

* Undo the platformio.ini changes to heltec_v4

* Drop unneeded src_filter lines

---------

Co-authored-by: Jonathan Bennett <jbennett@incomsystems.biz>
Co-authored-by: Jason P <applewiz@mac.com>

variants/nrf52840/rak4631/platformio.ini

@@ -8,9 +8,7 @@ build_type = release
 build_flags = ${nrf52840_base.build_flags}
   -I variants/nrf52840/rak4631
   -D RAK_4631
-  -DEINK_DISPLAY_MODEL=GxEPD2_213_BN
-  -DEINK_WIDTH=250
-  -DEINK_HEIGHT=122 
+  -DMESHTASTIC_USE_EINK_UI=0
   -DRADIOLIB_EXCLUDE_SX128X=1
   -DRADIOLIB_EXCLUDE_SX127X=1
   -DRADIOLIB_EXCLUDE_LR11X0=1
@@ -30,7 +28,10 @@ build_src_filter = ${nrf52_base.build_src_filter} \
   +<../variants/nrf52840/rak4631> \
   +<mesh/eth/> \
   +<mesh/api/> \
-  +<mqtt/>
+  +<mqtt/> \
+  -<graphics/EInkDisplay2.cpp> \
+  -<graphics/EInkDynamicDisplay.cpp> \
+  -<graphics/fonts/EinkDisplayFonts.cpp>
 lib_deps = 
   ${nrf52840_base.lib_deps}
   ${nrf52_networking_base.lib_deps}

variants/nrf52840/rak_wismeshtap/variant.h

@@ -300,6 +300,7 @@ SO GPIO 39/TXEN MAY NOT BE DEFINED FOR SUCCESSFUL OPERATION OF THE SX1262 - TG
 #define SPI_FREQUENCY 50000000
 #define TFT_SPI_PORT SPI1
 #define ST7789_CS WB_SPI_CS // Adds compatibility with the rest of the checking for a ST7789 TFT.
+#define USE_TFTDISPLAY 1
 
 #define SCREEN_ROTATE
 #define SCREEN_TRANSITION_FRAMERATE 5