plat-vexpress: Set CPSR.A when initializing
plat-vexpress: Set CPSR.A when initializing

Sets CPSR.A when initializing a core. The bit should already be
set by the OP-TEE Dispatcher in ARM Trusted Firmware but in case
it isn't make sure the bit is set.

Reviewed-by: Joakim Bech <741f90e2a7f4d9afbad8bd50be20560f4cf38962@linaro.org>
Reviewed-by: Pascal Brand <0b55292d2562685bad4ce52d64f802e8f1cd299e@linaro.org>
Tested-by: Pascal Brand <0b55292d2562685bad4ce52d64f802e8f1cd299e@linaro.org> (STM platform)
Tested-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org> (FVP platform)

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