spm: add url for hafnium/spm repository

Add "tforg" and "internal" url's for hafnium/spm repository and set
"tforg" url as default.

Change-Id: Ibfb7f3a79bdf4d498de0234549a4f5b8e75d3b2f
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
2 files changed