ANDROID: Re-enable CONFIG_STM for allmodconfig

It was disabled due to ld.lld discarding the __memcat_p symbol even
though it was exported -- see [1]. However, this issue has now been
fixed upstream in 7273ad2b ("kbuild: link lib-y objects to
vmlinux forcibly when CONFIG_MODULES=y"), so CONFIG_STM can now be
enabled safely.

[1] https://github.com/ClangBuiltLinux/linux/issues/515



Bug: 140224784
Fixes: dd88a4a1 ("ANDROID: Fix x86_64 allmodconfig build")
Signed-off-by: Quentin Perret <qperret@google.com>
Change-Id: Ic0dede721f67a0f2ff80ba27cb2a2aa9c7c03db3
Signed-off-by: Matthias Maennich <maennich@google.com>