platforms.config: hikey: Add note for upstream atf usage

hikey is now supported in upstream atf, i.e.
https://github.com/ARM-software/arm-trusted-firmware

but the way the OP-TEE binary is loaded differs from
https://github.com/96boards-hikey/arm-trusted-firmware

so add a note to inform users about setting a different TOS_BIN when
using upstream atf, otherwise firmware boot will hang.

Signed-off-by: Victor Chong <victor.chong@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
1 file changed