tile: revert change from <asm/atomic.h> to <linux/atomic.h> in asm files

The 32-bit TILEPro support uses some #defines in <asm/atomic_32.h>
for atomic support routines in assembly.  To make this more explicit,
I've turned those includes into includes of <asm/atomic_32.h>, which
should hopefully make it clear that they shouldn't be bombed into
<linux/atomic.h> in any cleanups.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

arch/tile/kernel/intvec_32.S

@@ -21,7 +21,7 @@
 #include <asm/ptrace.h>
 #include <asm/thread_info.h>
 #include <asm/irqflags.h>
-#include <linux/atomic.h>
+#include <asm/atomic_32.h>
 #include <asm/asm-offsets.h>
 #include <hv/hypervisor.h>
 #include <arch/abi.h>

arch/tile/lib/atomic_asm_32.S

@@ -70,7 +70,7 @@
  */
 
 #include <linux/linkage.h>
-#include <linux/atomic.h>
+#include <asm/atomic_32.h>
 #include <asm/page.h>
 #include <asm/processor.h>