fbdev: fix kerneldoc

As noticed by kbuild test robot <lkp@intel.com>,
remove_conflicting_pci_framebuffers()'s second argument
is called res_id not resource_id. Fix this.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/38ca9044455a33e398b45e0281643cc24da3c2fc.1536342224.git.mirq-linux@rere.qmqm.pl