Add lowRISC standard clang-format file

We use the Google C++ coding style
(https://google.github.io/styleguide/cppguide.html) with some
clarifications to make it more applicable for C, inspired by BoringSSL
(https://boringssl.googlesource.com/boringssl/+/HEAD/STYLE.md).

Author: imphil

.clang-format

@@ -0,0 +1,5 @@
+BasedOnStyle: Google
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+DerivePointerAlignment: false
+PointerAlignment: Right