ANDROID: kallsyms: strip hashes from function names with ThinLTO

With CONFIG_THINLTO and CFI both enabled, LLVM appends a hash to the
names of all static functions. This breaks userspace tools, so strip
out the hash from output.

Bug: 147422318
Change-Id: Ibea6be089d530e92dcd191481cb02549041203f6
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>