omap3_igep00x0: Rework MACH_TYPE and status LED logic slightly

The MACH_TYPE for IGEP0032 was never officially used and has been
removed from upstream, so we must not use it.  In order to remove this
we need to rework the status LED logic.

Cc: Enric Balletbo i Serra <eballetbo@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Enric Balletbo i Serra <eballetbo@gmail.com>