um: Avoid redefining ARCH_HAS_CACHE_LINE_SIZE

There is a generic ARCH_HAS_CACHE_LINE_SIZE option introduced by
commit c2280be81de4 ("mm: generalize ARCH_HAS_CACHE_LINE_SIZE")
in mm/Kconfig. Select that instead.

Signed-off-by: Tiwei Bie <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Johannes Berg <[e-mail]>

arch/um/Kconfig

···
 	bool
 	default y
 	select ARCH_WANTS_DYNAMIC_TASK_STRUCT
+	select ARCH_HAS_CACHE_LINE_SIZE
 	select ARCH_HAS_CPU_FINALIZE_INIT
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
···
 	int
 	range 1 1
 	default 1
-
-config ARCH_HAS_CACHE_LINE_SIZE
-	def_bool y
 
 source "arch/$(HEADER_ARCH)/um/Kconfig"