hnvram: rename hnvram binary

This change installs the hnvram binary to hnvram_binary under /bin
It also modifies the platform Makefile to test what platform we are
building for, conditionally symlinking either the hnvram_wrapper or
hnvram_binary to /bin/hnvram.

Change-Id: I3faeffe13c0d60439e3be63784ef8679a1f82b83
2 files changed