tflite: pkg_size: Ignore static libs and source files

https://crrev.com/c/5981742 will add a few `.a` files into tensorflow
package, but those files will not be installed onto DUT.

BUG=b:364243814
TEST=./script/pkg_size.py --board=rauru tensorflow

Change-Id: I56c0345695f55db0075c7ccf0e74af249f959c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/tflite/+/5998411
Commit-Queue: Tommy Chiang <ototot@google.com>
Auto-Submit: Shik Chen <shik@chromium.org>
Tested-by: Shik Chen <shik@chromium.org>
Reviewed-by: Tommy Chiang <ototot@google.com>

script/pkg_size.py

diff --git a/script/pkg_size.py b/script/pkg_size.py
index 1f0bc82..d997312 100755
--- a/script/pkg_size.py
+++ b/script/pkg_size.py
@@ -88,7 +88,7 @@
         # TODO(shik): Ignore files listed in install_mask.py instead of
         # hard-coding common masks here. Reference:
         # https://www.chromium.org/chromium-os/developer-library/guides/portage/ebuild-faq/#how-do-i-find-out-the-on-disk-package-size
-        if re.match(r"/usr/(include|lib/debug)/", file):
+        if re.search(r"^/usr/(include|lib/debug)/|\.(a|c|cc|h|hpp)$", file):
             continue
 
         path = sysroot / file.lstrip("/")