Retire FixedBuffer

replace it with std::vector<char>

Bug: 154346346
Test: boot
Merged-In: I51fc5cb2ea12dd3cc5868fb18429774a8493e12f
Change-Id: I9977f00d68222f8fc65a148847071785395e7787
Signed-off-by: Roman Kiryanov <rkir@google.com>
7 files changed