PCI: allow quirks to be compiled out

This patch adds the CONFIG_PCI_QUIRKS option which allows to remove all
the PCI quirks, which are not necessarily used on embedded systems when
PCI is working properly. As this is a size-reduction option, it depends
on CONFIG_EMBEDDED. It allows to save almost 12 kilobytes of kernel
code:

   text	   data	    bss	    dec	    hex	filename
1287806	 123596	 212992	1624394	 18c94a	vmlinux.old
1275854	 123596	 212992	1612442	 189a9a	vmlinux
 -11952       0       0  -11952   -2EB0 +/-

This patch has originally been written by Zwane Mwaikambo
<[email protected]> and is part of the Linux Tiny project.

Signed-off-by: Thomas Petazzoni <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>

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