hil: radio: remove buffers from initialize

These buffers should be passed to the object directly as not all users
are likely to want the same buffers (and this is in fact true today).

kernel/src/hil/radio.rs

@@ -74,14 +74,7 @@ impl<'a, T: RadioConfig<'a> + RadioData<'a>> Radio<'a> for T {}
 
 /// Configure the 802.15.4 radio.
 pub trait RadioConfig<'a> {
-    /// buf must be at least MAX_BUF_SIZE in length, and
-    /// reg_read and reg_write must be 2 bytes.
-    fn initialize(
-        &self,
-        spi_buf: &'static mut [u8],
-        reg_write: &'static mut [u8],
-        reg_read: &'static mut [u8],
-    ) -> Result<(), ErrorCode>;
+    fn initialize(&self) -> Result<(), ErrorCode>;
     fn reset(&self) -> Result<(), ErrorCode>;
     fn start(&self) -> Result<(), ErrorCode>;
     fn stop(&self) -> Result<(), ErrorCode>;