Vulkan: make framework gen script executable

Also adds the .gitignore file to ignore the auto generated .pyc files.

Bug: 134711355
Test: build, flash and boot.
Change-Id: I68621c4af73c422c9f42c92822fc4a1daf89a451
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0d20b64
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.pyc