Migrate remaining variants to new dir structure (#7412)

variants/esp32c6/tlora_c6/platformio.ini

@@ -0,0 +1,9 @@
+[env:tlora-c6]
+extends = esp32c6_base
+board = esp32-c6-devkitm-1
+build_flags = 
+  ${esp32c6_base.build_flags}
+  -D TLORA_C6
+  -I variants/esp32c6/tlora_c6
+  -DARDUINO_USB_CDC_ON_BOOT=1
+  -DARDUINO_USB_MODE=1

variants/esp32c6/tlora_c6/variant.h

@@ -0,0 +1,21 @@
+#define I2C_SDA 8 // I2C pins for this board
+#define I2C_SCL 9
+
+#define LED_PIN 7      // If defined we will blink this LED
+#define LED_STATE_ON 0 // State when LED is lit
+
+#define USE_SX1262
+#define LORA_SCK 6
+#define LORA_MISO 1
+#define LORA_MOSI 0
+#define LORA_CS 18
+#define LORA_RESET 21
+#define SX126X_CS LORA_CS
+#define SX126X_DIO1 23
+#define SX126X_DIO2 20
+#define SX126X_BUSY 22
+#define SX126X_RESET LORA_RESET
+#define SX126X_RXEN 15
+#define SX126X_TXEN 14
+#define SX126X_DIO2_AS_RF_SWITCH
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8