core: arm64: thread: update vector relative to vbar
core: arm64: thread: update vector relative to vbar

With CFG_CORE_UNMAP_CORE_AT_EL0=y the exception vector is updated to use
the minimal kernel mapping during user space execution. With this patch
vbar is updated relative to previous value in vbar to allow different
exception vectors for different cpu types.

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

pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os