build: remove clang-format-10

- No longer used now that ubuntu-18.04 is deprecated.
- Change default to clang-format-11 in checkstyle.sh

Type: make

Signed-off-by: Dave Wallace <dwallacelf@gmail.com>
Change-Id: I202244563738417bf4ae5b22fc8e2804bff2d25f
diff --git a/extras/scripts/checkstyle.sh b/extras/scripts/checkstyle.sh
index f26dc23..053342f 100755
--- a/extras/scripts/checkstyle.sh
+++ b/extras/scripts/checkstyle.sh
@@ -20,7 +20,7 @@
 
 # TODO: Remove clang-format-${CLANG_FORMAT_VER} from 'make install-deps' when
 #       CLANG_FORMAT_VER default value is upgraded
-CLANG_FORMAT_VER=${CLANG_FORMAT_VER:-10}
+CLANG_FORMAT_VER=${CLANG_FORMAT_VER:-11}
 GIT_DIFF_ARGS="-U0 --no-color --relative HEAD~1"
 CLANG_FORMAT_DIFF_ARGS="-style file -p1"
 SUFFIX="-${CLANG_FORMAT_VER}"