boards/geprc-f722-v2: add F722 V2 declaration

boards/geprc-f722-v2/src/main.rs

@@ -0,0 +1,11 @@
+#![no_std]
+#![no_main]
+
+#[cfg(not(feature = "uart2-wire-test"))]
+mod board;
+
+#[cfg(feature = "uart2-wire-test")]
+platform_stm32f7::geprc_uart2_wire_test!();
+
+#[cfg(not(feature = "uart2-wire-test"))]
+platform_stm32f7::flight_firmware!(board::GeprcF722V2);