Add BetaFPV V2 nano targets #302

Job	Run time
targets	4s
build (ESP_TX_Backpack_via_UART)	1m 23s
build (Orqa_ESP_RX_Backpack_via_UART)	1m 15s
build (Orqa_ESP01F_Backpack_via_UART)	1m 17s
build (Orqa_HappyModel_EP82_VRX_Backpack_via_UART)	1m 16s
build (Skyzone_SteadyView_ESP_RX_Backpack_via_UART)	48s
build (Skyzone_SteadyView_ESP01F_Backpack_via_UART)	48s
build (Skyzone_SteadyView_HappyModel_EP82_VRX_Backpack_via_UART)	58s
build (Skyzone_Onboard_ESP32_Backpack_via_UART)	1m 20s
build (Rapidfire_ESP_RX_Backpack_via_UART)	1m 21s
build (Rapidfire_ESP01F_Backpack_via_UART)	1m 19s
build (Rapidfire_HappyModel_EP82_VRX_Backpack_via_UART)	1m 14s
build (Rapidfire_ESP12F_Backpack_via_UART)	1m 13s
build (RX5808_ESP_RX_Backpack_via_UART)	1m 13s
build (RX5808_ESP01F_Backpack_via_UART)	1m 23s
build (RX5808_HappyModel_EP82_VRX_Backpack_via_UART)	55s
build (RX5808_ESP12F_Backpack_via_UART)	54s
build (RX5808_Diversity_ESP01F_Backpack_via_UART)	1m 18s
build (DEBUG_ESP_RX_Backpack_via_UART)	1m 13s
build (DEBUG_TX_Backpack_via_UART)	1m 13s
build (DEBUG_ESP32_TX_Backpack_via_UART)	1m 28s
build (Fusion_Builtin_Backpack_via_UART)	1m 19s
build (STM_TX_Backpack_via_UART)	51s
build (HDZero_RX51_ESP_RX_Backpack_via_UART)	1m 23s
build (HDZero_RX51_ESP01F_Backpack_via_UART)	1m 14s
build (HDZero_RX51_HappyModel_EP82_VRX_Backpack_via_UART)	1m 12s
build (HDZero_RX51_ESP32_Backpack_via_UART)	1m 22s
build (HDZero_Goggle_ESP32_Backpack_via_UART)	1m 32s
firmware	19s
	33m 5s

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