Decrypt the constant values by proper enum names. This time in
set_mode().

Define two of them as DEC ('CSI ?') is about to be split away in the
next patches.
Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20240202065608.14019-3-jirislaby@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>