sparc32: Kill btfixup for xchg()'s 'swap' instruction.

We always have this instruction available, so no need to use
btfixup for it any more.

This also eradicates the whole of atomic_32.S and thus the
__atomic_begin and __atomic_end symbols completely.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile
index a3fc437..33d8d85 100644
--- a/arch/sparc/lib/Makefile
+++ b/arch/sparc/lib/Makefile
@@ -13,7 +13,7 @@
 lib-y                 += strncpy_from_user_$(BITS).o strlen_user_$(BITS).o
 lib-$(CONFIG_SPARC32) += divdi3.o udivdi3.o
 lib-$(CONFIG_SPARC32) += copy_user.o locks.o
-lib-y                 += atomic_$(BITS).o
+lib-$(CONFIG_SPARC64) += atomic_64.o
 lib-$(CONFIG_SPARC32) += lshrdi3.o ashldi3.o
 lib-$(CONFIG_SPARC32) += muldi3.o bitext.o cmpdi2.o