check BGE_SGDIG_STS when the chip is NOT a 5717 A0, like freebsd.
check BGE_SGDIG_STS when the chip is NOT a 5717 A0, like freebsd.

found by david imhoff.
tested by david on a 5719 and by me on a 5720 and 5721

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars