[MTD] [NAND] S3C2410 correctly set nFCE over resume

Ensure the nFCE line is de-asserted over suspend and
then re-initialised when the system resumes. This is
to ensure that the NAND is kept in lowest power mode
over suspend (power settings are only specified for
nFCE inactive) as well as fixing the Simtec Osiris
which relies on nFCE being inactive.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>