s390: select ARCH_USE_SYM_ANNOTATIONS

All old style assembly annotations have been converted for s390. Select
ARCH_USE_SYM_ANNOTATIONS to make sure the old macros like ENTRY() aren't
available anymore. This prevents that new code which uses the old macros
will be added again.

This follows what has been done for x86 with commit 2ce0d7f9 ("x86/asm:
Provide a Kconfig symbol for disabling old assembly annotations") and for
arm64 with commit 50479d58 ("arm64: Disable old style assembly
annotations").

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>