ext qmsi: Update QMSI version on README

QMSI 1.4 was finally released, and there are no changes to drivers
from RC4. This updates the README file on ext/hal/qmsi/ to point to
the correct release version.

Change-Id: I52a537058ff15cb1602d16bc7c46c49d44876e63
Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>