The ti-gfx package supports a set of SGX implementations which are used in some TI SoCs, newer parts are not supported by this package. This patch adds a list of supported TI SoCs to the help text. Signed-off-by: Lothar Felten <lothar.felten@gmail.com> [Thomas: update with the new name of packages: ti-sgx-{km,um}.] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>