Scanning code we found /opt/storage/sdcard. We are thinking that
the it matches a need for the mount points of removable devices.
Then we add here the variable TZ_SYS_STORAGE=/opt/storage.
Change-Id: Ibdd8ba0b5b3df0798ddedad4a143eaa28cfbd9be Signed-off-by: José Bollo <jose.bollo@open.eurogiciel.org>