Align __start_ta_head_section on 8-byte boundary
Align __start_ta_head_section on 8-byte boundary

Fixes an issue on 64-bit HiKey when running the self-tests of
https://github.com/OP-TEE/optee_os/pull/371. The tests would pass
when CFG_TEE_CORE_LOG_LEVEL=2 but fail with static TA not found
when log level is 3.

Signed-off-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org>
Reviewed-by: Joakim Bech <741f90e2a7f4d9afbad8bd50be20560f4cf38962@linaro.org>
Reviewed-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org>

matt2048/optee_os,pascal-brand-st-dev/optee_os,Microsoft/optee_os,chshxi1989/optee_os,matt2048/optee_os,Microsoft/optee_os,BreezeWu/optee_os,pascal-brand-st-dev/optee_os,cedric-chaumont-st-dev/optee_os,matt2048/optee_os,BreezeWu/optee_os,chshxi1989/optee_os,BreezeWu/optee_os,matt2048/optee_os,BreezeWu/optee_os,cedric-chaumont-st-dev/optee_os,BreezeWu/optee_os,Microsoft/optee_os,chshxi1989/optee_os,pascal-brand-st-dev/optee_os,chshxi1989/optee_os,cedric-chaumont-st-dev/optee_os,cedric-chaumont-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,Microsoft/optee_os,Microsoft/optee_os,chshxi1989/optee_os