ARM: pxa910: correct nand pmu setting

commit d204b2c5 upstream.

The original pair of <0x01db, 208000000> is invalid.
Correct to the valid value.

Signed-off-by: Lei Wen <leiwen@marvell.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>