Fix NOR flash device ID reading

Fix NOR flash device ID reading

Fix NOR flash manufacturer and device ID reading.  This now
properly takes into account device widths and device max widths
as required.  The reading of these IDs uses the same max_width
dependent addressing as CFI queries.

The old code remains for chips that don't specify a device width,
as the new code relies on a device width being set in order to
properly operate.  The existing code seems very broken.

Only ident0 and ident1 are used in the new code, as other fields
relate to the lock state of blocks in flash.

The VExpress flash configuration has been updated to match
the new code, as the existing definition was 'wrong' in order
to return the expected results with the broken device ID code.

Signed-off-by: Roy Franz <roy.franz@linaro.org>
Message-id: 1386279359-32286-8-git-send-email-roy.franz@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>