Remove ugly and weird MTD_PROGREGION_CTRLMODE_VALID() and
MTD_PROGREGION_CTRLMODE_INVALID() macros. There is only one
user of them and they are used locally just for printing.

Anyway, this patch is a preparation for removing mtd->ecctype
and mtd->eccsize, but these macros use them. Fix this.
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>