sf: Add SPI protection mechanism from the kernel
Add the SPI NOR protection mechanism from the kernel. This code is based on the work from Brian Norris <computersforpeace@gmail.com> Here is the commit details: "mtd: spi-nor: refactor block protection functions" (sha1: 62593cf40b23b523b9fc9334ca61ba6c595ebb09) Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com> Signed-off-by: NJagan Teki <jteki@openedev.com> Reviewed-by: NTom Rini <trini@konsulko.com> Reviewed-by: NHeiko Schocher <hs@denx.de> Reviewed-by: NJagan Teki <jteki@openedev.com> Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
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