imx9: container.cfg: Guard tee.bin inclusion

Guard the inclusion of tee.bin with the CONFIG_OPTEE symbol to fix the
following build warning:

  CHECK    u-boot-container.cfgout
WARNING './tee.bin' not found, resulting binary may be not-functional
  BINMAN  .binman_stamp
  OFCHK   .config

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
1 file changed