[SPARC64]: Decrease SECTION_SIZE_BITS to 30.

We'll need this to handle NUMA properly on some systems.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/asm-sparc64/sparsemem.h

@@ -3,7 +3,7 @@
 
 #ifdef __KERNEL__
 
-#define SECTION_SIZE_BITS       31
+#define SECTION_SIZE_BITS       30
 #define MAX_PHYSADDR_BITS       42
 #define MAX_PHYSMEM_BITS        42