pci: remove unused .gitignore file

Commit 982245f0 ("remove
CONFIG_PCI_NAMES") removed pci's usage of classlist.h, devlist.h, and
gen-devlist. Remove pci's .gitignore file, because now none of its
entries are used.
Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/pci/.gitignore

-classlist.h
-devlist.h
-gen-devlist
-