bd_int13probe() should check extended info if sector info is bad

In some Dell systems and usb stick combinations, it is found that
int13 AH=08 is reporting back bad sector information, preventing the
boot.

This update is allowing bd_int13probe() to use extended info call to
build disk properties.

It also can happen the total sectors count from extended info may be
wrong, in such case, the CHS data is used to calculate total sectors.

Reviewed by: allanjude
Approved by: allanjude (mentor)
Differential Revision: https://reviews.freebsd.org/D7718