Add an Automatic Antenna Tracker (AAT) backpack #301

Job	Run time
targets	7s
build (ESP_TX_Backpack_via_UART)	59s
build (Fusion_Builtin_Backpack_via_UART)	59s
build (Orqa_ESP_RX_Backpack_via_UART)	1m 7s
build (Orqa_ESP01F_Backpack_via_UART)	56s
build (Orqa_HappyModel_EP82_VRX_Backpack_via_UART)	59s
build (DEBUG_ESP_RX_Backpack_via_UART)	57s
build (DEBUG_TX_Backpack_via_UART)	59s
build (DEBUG_ESP32_TX_Backpack_via_UART)	1m 25s
build (STM_TX_Backpack_via_UART)	1m 0s
build (Skyzone_SteadyView_ESP_RX_Backpack_via_UART)	1m 11s
build (Skyzone_SteadyView_ESP01F_Backpack_via_UART)	1m 2s
build (Skyzone_SteadyView_HappyModel_EP82_VRX_Backpack_via_UART)	1m 7s
build (Skyzone_Onboard_ESP32_Backpack_via_UART)	1m 27s
build (HDZero_RX51_ESP_RX_Backpack_via_UART)	59s
build (HDZero_RX51_ESP01F_Backpack_via_UART)	1m 6s
build (HDZero_RX51_HappyModel_EP82_VRX_Backpack_via_UART)	1m 6s
build (HDZero_RX51_ESP32_Backpack_via_UART)	1m 40s
build (HDZero_Goggle_ESP32_Backpack_via_UART)	1m 34s
build (AAT_ESP_Backpack_via_UART)	1m 6s
build (RX5808_ESP_RX_Backpack_via_UART)	1m 7s
build (RX5808_ESP01F_Backpack_via_UART)	57s
build (RX5808_HappyModel_EP82_VRX_Backpack_via_UART)	1m 13s
build (RX5808_ESP12F_Backpack_via_UART)	56s
build (RX5808_Diversity_ESP01F_Backpack_via_UART)	1m 5s
build (Rapidfire_ESP_RX_Backpack_via_UART)	1m 7s
build (Rapidfire_ESP01F_Backpack_via_UART)	59s
build (Rapidfire_HappyModel_EP82_VRX_Backpack_via_UART)	1m 7s
build (Rapidfire_ESP12F_Backpack_via_UART)	1m 3s
firmware	18s
	31m 38s

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