[SCSI] Unexport scsi/scsi.h from headers_install

The scsi/scsi.h header is normally provided by the libc (and was not
exported by the kernel since 2.6.24) and has been until it was
re-exported with 2.6.31.  The kernel version is not userspace clean and
does not appear to provide anything useable in userland over the
(e)glibc version.
Signed-off-by: NTom Rini <tom_rini@mentor.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

include/scsi/Kbuild

-header-y += scsi.h
 header-y += scsi_netlink.h
 header-y += scsi_netlink_fc.h
 header-y += scsi_bsg_fc.h