sim: Remove extraneous static

According to clippy, `&'static` can just be `&` for static definitions,
which always have a static lifetime.  Clean this up in the arrays in the
code, as well as generation code in imgtool.

Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/scripts/imgtool/keys/general.py b/scripts/imgtool/keys/general.py
index e8755f6..8e3c65b 100644
--- a/scripts/imgtool/keys/general.py
+++ b/scripts/imgtool/keys/general.py
@@ -31,7 +31,7 @@
 
     def emit_rust_public(self, file=sys.stdout):
         self._emit(
-                header="static {}_PUB_KEY: &'static [u8] = &[".format(self.shortname().upper()),
+                header="static {}_PUB_KEY: &[u8] = &[".format(self.shortname().upper()),
                 trailer="];",
                 encoded_bytes=self.get_public_bytes(),
                 indent="    ",