Migrate to libfdt

Replace our custom FDT parser implementation with libfdt while retaining
the original API as a thin wrapper around libfdt. This minimizes the
changes to the rest of our code base and hides differences in coding

As a byproduct, this fixes an issue with unaligned memory accesses while
parsing as libfdt handles these correctly.

Bug: 150587116
Change-Id: I8d305d7094b1be04608048009d73d7c448a578a0
30 files changed