omap_gpmc: move prefetch out of CONFIG_NAND_OMAP_ELM
The prefech mode is a feature of the gpmc, not the ELM. An am3517 does not have an elm, but can do prefeches, so move the code out of the CONFIG_NAND_OMAP_ELM ifdef. Cc: Scott Wood <scottwood@freescale.com> Cc: Tom Rini <trini@konsulko.com> Cc: Daniel Mack <zonque@gmail.com> Signed-off-by: NJeroen Hofstee <jeroen@myspectrum.nl> Reviewed-by: NTom Rini <trini@konsulko.com>
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