app: aboot: mdtp: read mdtp eFuse in runtime

Since 8976 and 8952 have the same binaries,
we can no longer pick the relevant mdtp eFuse
during compilation. Therefore, the code was
modified to retrieve the correct eFuse in
runtime, based on the target we actually
run on.

Change-Id: I14a80bab43b08939c73b010fa8c607982bc8cc6d
6 files changed