scsi: Remove unused read-6 command
scsi: Remove unused read-6 command

SLOF does not use the obsolete "READ (6)" SCSI command, and
according to the comment in front of the "scsi-build-read?"
Forth word, it is even not supported by a couple of devices
anymore, so we do not need to keep the code for this command
in our SLOF sources around.

Signed-off-by: Thomas Huth <9e65be74847981e55b2564b6266c57d86d3bac05@redhat.com>
Signed-off-by: Alexey Kardashevskiy <ac1fc56530d7d037e1ea666f130daca22d72f964@ozlabs.ru>

open-power-host-os/slof,stefanberger/SLOF-tpm,qemu/SLOF,aik/SLOF,aik/SLOF,open-power-host-os/slof,stefanberger/SLOF-tpm,aik/SLOF,open-power-host-os/slof,qemu/SLOF,qemu/SLOF,open-power-host-os/slof,stefanberger/SLOF-tpm