fix(support_rp2040): don't require cortex-m/inline-asm

It causes a build failure when compiled for a mismatching target.

Author: yvt

src/r3_support_rp2040/Cargo.toml

@@ -29,7 +29,7 @@ embedded-hal = { version = "0.2.4", optional = true }
 usbd-serial = { version = "0.1.1", optional = true }
 inline_dyn = { version = "0.1.1", optional = true }
 usb-device = { version = "0.2.7", optional = true }
-cortex-m = { version = "0.6.3", optional = true, features = ["inline-asm"] }
+cortex-m = { version = "0.6.3", optional = true }
 rp2040 = { version = "0.1.0" }
 vcell = { version = "0.1.2", optional = true }
 nb = { version = "1.0.0", optional = true }