core: bugfix tee_pager_rem_uta_region()
core: bugfix tee_pager_rem_uta_region()

Prior to this patch tee_pager_rem_uta_region() just removed a matching
area without proper unregistration. This patch fixes that by looking up
all physical pages that may use the area and frees the page.

Reviewed-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org>
Reviewed-by: Etienne Carriere <f21bc5b8f3ea1962eb45af359f1abea6578cab94@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