We received multiple reports that disks with 2k sector size are not automounted.
pcfs was has been fixed in snv_75 to understand 2k sector size:
6393753 A pcfs with 2k sector size cannot be mounted on Solaris: FAT signature error
HAL relies on libfstyp to detect mountable volumes. fstyp was fixed in snv_81:
6567512 fstyp needs to support 2kB sectorsize media
but it only fixed interaction between fstyp command and libfstyp, but not interaction
between HAL and libfstyp. The latter is the subject on this CR.