pvscsi: Scan all 64 possible targets

pvscsi: Scan all 64 possible targets

The max number of targets per PVSCSI controller is 64, not 7.
This can easily be seen in QEMU PVSCSI emulation code
(hw/scsi/vmw_pvscsi.c) as PVSCSI_MAX_DEVS, which defines the
number of targets, have value of 64.

Fixes: 83d60b3c474b ("Add pvscsi boot support")
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Reviewed-by: Mark Kanda <mark.kanda@oracle.com>
Signed-off-by: Shmuel Eiderman <shmuel.eiderman@oracle.com>