s390/purgatory: hard-code obj-y in Makefile

The purgatory/ directory is entirely guarded in arch/s390/Kbuild.
CONFIG_ARCH_HAS_KEXEC_PURGATORY is bool type.

$(CONFIG_ARCH_HAS_KEXEC_PURGATORY) is always 'y' when Kbuild visits
this Makefile for building.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20220613170902.1775211-2-masahiroy@kernel.org
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>