cmake: Change error message when git not found to say UPM
cmake: Change error message when git not found to say UPM

Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>
Signed-off-by: Mihai Tudor Panu <a27de6130c5d32f5817bf40bb8b348582f37a8af@intel.com>

kissbac/upm,srware/upm,tylergibson/upm,noahchense/upm,arfoll/upm,spitfire88/upm,srware/upm,ShawnHymel/upm,ShawnHymel/upm,MakerCollider/upm,malikabhi05/upm,ShawnHymel/upm,whbruce/upm,pylbert/upm,afmckinney/upm,Propanu/upm,intel-iot-devkit/upm,spitfire88/upm,g-vidal/upm,intel-iot-devkit/upm,afmckinney/upm,kissbac/upm,tylergibson/upm,tylergibson/upm,andreivasiliu2211/upm,arfoll/upm,intel-iot-devkit/upm,mircea/upm,jontrulson/upm,afmckinney/upm,intel-iot-devkit/upm,kissbac/upm,tylergibson/upm,jontrulson/upm,spitfire88/upm,Propanu/upm,skiselev/upm,andreivasiliu2211/upm,pylbert/upm,pylbert/upm,intel-iot-devkit/upm,nitirohilla/upm,arfoll/upm,sasmita/upm,jontrulson/upm,srware/upm,MakerCollider/upm,ShawnHymel/upm,MakerCollider/upm,stefan-andritoiu/upm,stefan-andritoiu/upm,spitfire88/upm,intel-iot-devkit/upm,GSmurf/upm,tripzero/upm,rafaneri/upm,mircea/upm,g-vidal/upm,rafaneri/upm,arfoll/upm,Jon-ICS/upm,nitirohilla/upm,Jon-ICS/upm,fieldhawker/upm,Propanu/upm,MakerCollider/upm,GSmurf/upm,mircea/upm,Jon-ICS/upm,g-vidal/upm,Vaghesh/upm,rafaneri/upm,fieldhawker/upm,g-vidal/upm,sasmita/upm,rafaneri/upm,tylergibson/upm,afmckinney/upm,noahchense/upm,sasmita/upm,jontrulson/upm,stefan-andritoiu/upm,nitirohilla/upm,whbruce/upm,spitfire88/upm,malikabhi05/upm,rafaneri/upm,andreivasiliu2211/upm,pylbert/upm,Vaghesh/upm,yoyojacky/upm,afmckinney/upm,mircea/upm,tripzero/upm,noahchense/upm,tripzero/upm,skiselev/upm,whbruce/upm,nitirohilla/upm,skiselev/upm,ShawnHymel/upm,jontrulson/upm,skiselev/upm,pylbert/upm,malikabhi05/upm,tripzero/upm,kissbac/upm,tripzero/upm,srware/upm,malikabhi05/upm,Propanu/upm,whbruce/upm,Jon-ICS/upm,yoyojacky/upm,yoyojacky/upm,Jon-ICS/upm,MakerCollider/upm,g-vidal/upm,yoyojacky/upm,andreivasiliu2211/upm,stefan-andritoiu/upm,pylbert/upm,g-vidal/upm,fieldhawker/upm,sasmita/upm,malikabhi05/upm,Vaghesh/upm,skiselev/upm,Vaghesh/upm,srware/upm,malikabhi05/upm,Propanu/upm,skiselev/upm,sasmita/upm,arfoll/upm,kissbac/upm,mircea/upm,fieldhawker/upm,stefan-andritoiu/upm,noahchense/upm,yoyojacky/upm,Propanu/upm,stefan-andritoiu/upm,GSmurf/upm,whbruce/upm,nitirohilla/upm,GSmurf/upm,andreivasiliu2211/upm