mtd: spi-nor: allow dual/quad reads on S25FL129P
mtd: spi-nor: allow dual/quad reads on S25FL129P

According to the datasheet[1], both S25FL129P0 (256kB sectors) and
S25FL129P1 (64kB sectors) support dual read, quad read, dual i/o read
and quad i/o read.

I have verified dual read to be working for S25FL129P1 on a dual
capable spi controller. Quad as well as S25FL129P0 is untested, lacking
hardware to verify.

[1] http://www.spansion.com/Support/Datasheets/S25FL129P_00.pdf

Signed-off-by: Jonas Gorski <8a35dafb21031d5c8209b1c0c47aaf0390b56a0e@openwrt.org>
Reviewed-by: Marek Vasut <f40600653b33f5282fa4c5daf377dfc444fb4625@denx.de>
Signed-off-by: Brian Norris <ac73eed4b8a8c9127255a2696c52b2e7503720b8@gmail.com>

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