add LR 2021 to portduino, and allow Framebuffer devices to rotate the screen from config (#11252)

* add LR 2021 to portduino, and allow Framebuffer devices to rotate the screen from config. Requires https://github.com/meshtastic/device-ui/pull/355 and supersedes https://github.com/meshtastic/firmware/pull/10567 and https://github.com/meshtastic/firmware/pull/11138

Many thanks to the original authors https://github.com/a-li3n and https://github.com/jessm33

* Build LR2021Interface.cpp in the wasm env

initLoRa() constructs LR2021Interface for Lora.Module: lr2021, so excluding
the file from the native-wasm source filter left the constructor undefined at
link time. LR20x0Interface.cpp stays excluded; it is template-only and comes in
via the InterfacesTemplates.cpp amalgamation.

Also replace the non-UTF-8 degree signs in the framebuffer rotation comment and
correct the rfswitch alias cleanup comment.

* Trim comments

* Report setenv failure for the framebuffer rotation

src/graphics/tftSetup.cpp

@@ -11,6 +11,8 @@
 
 #ifdef ARCH_PORTDUINO
 #include "PortduinoGlue.h"
+#include <cstdio>
+#include <cstdlib>
 #include <thread>
 #endif
 
@@ -60,6 +62,11 @@ void tftSetup(void)
         } else
 #elif defined(USE_FRAMEBUFFER)
         if (portduino_config.displayPanel == fb) {
+            // Rotation from yaml Display.OffsetRotate: 1=90, 2=180, 3=270 deg
+            char rbuf[4];
+            snprintf(rbuf, sizeof(rbuf), "%d", portduino_config.displayRotate ? (portduino_config.displayOffsetRotate & 3) : 0);
+            if (setenv("MESHTASTIC_FB_ROTATION", rbuf, 1) != 0)
+                LOG_ERROR("Failed to set MESHTASTIC_FB_ROTATION, framebuffer will use its default rotation");
             if (portduino_config.displayWidth && portduino_config.displayHeight)
                 displayConfig = DisplayDriverConfig(DisplayDriverConfig::device_t::FB, (uint16_t)portduino_config.displayWidth,
                                                     (uint16_t)portduino_config.displayHeight);