BACKPORT: kbuild: fix UNUSED_KSYMS_WHITELIST for Clang LTO

Commit fbe078d3 ("kbuild: lto: add a default list of used symbols")
does not work as expected if the .config file has already specified
CONFIG_UNUSED_KSYMS_WHITELIST="my/own/white/list" before enabling
CONFIG_LTO_CLANG.

So, the user-supplied whitelist and LTO-specific white list must be
independent of each other.

I refactored the shell script so CONFIG_MODVERSIONS and CONFIG_CLANG_LTO
handle whitelists in the same way.

Fixes: fbe078d3 ("kbuild: lto: add a default list of used symbols")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
(cherry picked from commit a6aaeb84)
[fix conflicts due to renaming of lto-used-symbols.txt]
Bug: 187129171
Signed-off-by: Connor O'Brien <connoro@google.com>
Change-Id: I044ce75df5a3eb82adeb5bae665192eb836e8c63