Standardise safety comments in pvmfw and fdtpci.

Bug: 290018030
Test: m pvmfw_bin
Change-Id: Ia6aaf9e226d6594c6f97543857ce4f3b739dc699
diff --git a/pvmfw/src/dice.rs b/pvmfw/src/dice.rs
index fbab013..28271d3 100644
--- a/pvmfw/src/dice.rs
+++ b/pvmfw/src/dice.rs
@@ -91,7 +91,7 @@
 /// .data, or provided BCC).
 #[no_mangle]
 unsafe extern "C" fn DiceClearMemory(_ctx: *mut c_void, size: usize, addr: *mut c_void) {
-    // SAFETY - We must trust that the slice will be valid arrays/variables on the C code stack.
+    // SAFETY: We must trust that the slice will be valid arrays/variables on the C code stack.
     let region = unsafe { slice::from_raw_parts_mut(addr as *mut u8, size) };
     flushed_zeroize(region)
 }