ec: Add directory local configuration for Emacs

Since ec uses Linux kernel code style, this adds support for a feature
in emacs to use a specific code style in a directory and its
subdiretories. Looks like this technique is used in a few other spots in
chromium code.

BUG=None
BRANCH=none
TEST=Emacs 26.1 recognizes and uses just fine

Change-Id: Ic8007accf6746cb1a4c2ca0050fa06884d598da3
Signed-off-by: Jack Rosenthal <[email protected]>
Reviewed-on: https://chromium-review.googlesource.com/1493036
Commit-Ready: ChromeOS CL Exonerator Bot <[email protected]>
Reviewed-by: Tim Wawrzynczak <[email protected]>
Reviewed-by: Raul E Rangel <[email protected]>

Author: jackrosenthal

.dir-locals.el

@@ -0,0 +1,4 @@
+((c-mode . ((c-file-style . "linux")
+            (c-basic-offset . 8)
+            (tab-width . 8)
+            (indent-tabs-mode . t))))