matching, making it properly detect devices on OpenFirmware platforms
(prior to this patch the driver misdetected non-JEDEC chips, seeing all
chips as "m25p80").

Also, now jedec_probe() only does jedec probing, nothing else.  If it is
not able to detect a chip, NULL is returned and the driver fall backs to
the information specified by the platform (platform_data, or exact ID).
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>