s390/tape: Remove special block id handling

s390/tape: Remove special block id handling

For real 3490 tape models a logical block was composed of a direction
bit (wrap), a segment number, a format mode, and a logical block number.
This is represented in a 4byte identifier.

The Virtual Tape Server (VTS) emulates 3490 tape devices and uses a
stripped block id format where bit 0-9 of the 4byte identifier are
always 0. Bit 10-31 represent the logical block number.

All tapes use the 3480-2 XF format, which was defined via
TAPE34XX_FMT_3480_2_XF but never used. There is also no special handling
required anymore as this is the only format being used.

Since VTS doesn't require any special handling of block ids and format,
corresponding code is removed.

Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>