refactor: move firmware workspace under firmware

firmware/platforms/stm32f7/Cargo.toml

@@ -0,0 +1,36 @@
+[package]
+name = "platform-stm32f7"
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+version.workspace = true
+
+[lints]
+workspace = true
+
+[lib]
+# This is a bare-metal `no_std` platform library with its own panic handler.
+# Host-verifiable invariants live in `tests/platform_safety_boundary.rs`; a
+# generated lib-test harness would link `std` and a second panic handler.
+test = false
+
+[features]
+default = []
+
+[dependencies]
+kaptan-board = { path = "../../libs/kaptan-board" }
+kaptan-data-channel = { path = "../../libs/kaptan-data-channel" }
+kaptan-dma = { path = "../../libs/kaptan-dma" }
+kaptan-drivers = { path = "../../libs/kaptan-drivers" }
+kaptan-i2c = { path = "../../libs/kaptan-i2c" }
+kaptan-log = { path = "../../libs/kaptan-log" }
+kaptan-log-mavlink = { path = "../../libs/kaptan-log-mavlink" }
+kaptan-mavlink = { path = "../../libs/kaptan-mavlink" }
+kaptan-sensor = { path = "../../libs/kaptan-sensor" }
+kaptan-spi = { path = "../../libs/kaptan-spi" }
+kaptan-time = { path = "../../libs/kaptan-time" }
+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"] }
+panic-halt = "1"