livepatch-build: Strip all metadata symbols from hotpatch modules

livepatch-build: Strip all metadata symbols from hotpatch modules

Strip all unneeded metadata symbols from generated hotpatch modules.
The metadata symbols are the symbols from metadata-like sections (e.g.
'.livepatch.funcs') or livepatch hooks symbols (defined by a set of
prefixes. E.g. 'livepatch_load_data_').

By default the create-diff-object does not create symbols in metadata
sections. However, such symbols may be implicitly added by speciying
extra entries in the sections manually (in a given patch).
The symbols are not needed for the hotpatch modules and should be
stripped to avoid symbol names collisions and to save hotpatch files
space.

Signed-off-by: Pawel Wieczorkiewicz <wipawel@amazon.de>