Move manifest to initrd

Supporting the manifest as part of FDT is problematic for testing
under the Android boot flow because it requires compiling and flashing
a different Hafnium image per test suite. Moving it back to the initrd
allows us to run different test suites against the same Hafnium image,
only by swapping the RAM disks.

Hafnium's one_time_init() routine will now expect to find the manifest
under "manifest.dtb".

Change-Id: Ifabffb50b06ffaba786046733d575adc9d43f4ad
18 files changed