FROMLIST: arm64: select ARCH_SUPPORTS_LTO_CLANG

Allow CONFIG_LTO_CLANG to be enabled for the architecture.

Bug: 62093296
Bug: 67506682
Bug: 133186739
Change-Id: Id8e06b49877c4de2f15b51fc432d601b83b2c68f
(am from https://patchwork.kernel.org/patch/10060333/

)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>