um: use asm-generic/scatterlist.h

commit ff35bd5
(lib/scatterlist: make ARCH_HAS_SG_CHAIN an actual Kconfig) changed
some architectures to use the generic scatterlist.h but this broke
um:

In file included from init/main.c:75:0:
include/linux/blkdev.h:25:29: fatal error: asm/scatterlist.h:
        No such file or directory

Make um use the generic scatterlist.h as well

Reported-by: kbuild test robot <[email protected]>
Cc: kbuild test robot <[email protected]>
Cc: Jeff Dike <[email protected]>
Cc: Richard Weinberger <[email protected]>
Signed-off-by: Laura Abbott <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: labbott

arch/um/include/asm/Kbuild

@@ -21,6 +21,7 @@ generic-y += param.h
 generic-y += pci.h
 generic-y += percpu.h
 generic-y += preempt.h
+generic-y += scatterlist.h
 generic-y += sections.h
 generic-y += switch_to.h
 generic-y += topology.h