[mystery] Change the file that is checked during initialization to something else.

For some reason file /usr/lib/libsrv_um.so now exists in our images and thus the
initialization process doesn't go through properly. However file /usr/lib/sgx/libEGL-sgx.so
doesn't exist so lets check that one instead ;)

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>