Add missing SPDX license identifiers

Signed-off-by: Pavo Banicevic <[email protected]>

include/ublksrv_priv.h and include/ublksrv_tgt.h are private
header, which should be used by target code used, so change to
dul GPL and MIT licence.

Signed-off-by: Ming Lei <[email protected]>
29 files changed