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This patch introduces the following changes to enable
compilation for `SPD=spmd` command line option.

* compile plat_spmd_manifest.c
* compile libfdt source files

Verified with the `SPD=spmd` command line option for
Tegra194 platforms.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Change-Id: I7f57aa4f1756b19f78d87415bb80794417174bc8