Add some basic .gitignore files

This still leaves driver and architecture-specific subdirectories alone,
but gets rid of the bulk of the "generic" generated files that we should
ignore.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/pci/.gitignore b/drivers/pci/.gitignore
new file mode 100644
index 0000000..f297ca8
--- /dev/null
+++ b/drivers/pci/.gitignore
@@ -0,0 +1,4 @@
+classlist.h
+devlist.h
+gen-devlist
+