More .gitignore updates

Added .pyc and .sha1 to the top-level .gitignore.

Change-Id: I7dfc4f554d54d22947b38140d3305007503cc16a
Tested-by: George Joseph <george.joseph@fairview5.com>

.gitignore

@@ -27,3 +27,5 @@ defaults.h
 makeopts
 makeopts.embed_rules
 menuselect-tree
+*.sha1
+*.pyc