platforms/stm32f7: always compile F722 firmware

platforms/stm32f7/Cargo.toml

@@ -27,6 +27,4 @@ cortex-m = "0.7"
 cortex-m-rt = "0.7"
 rtic = { version = "2.3", default-features = false, features = ["thumbv7-backend"] }
 stm32f7 = { version = "0.16", default-features = false, features = ["rt", "stm32f722"] }
-
-[target.'cfg(target_arch = "arm")'.dependencies]
 panic-halt = "1"