[SPARC64]: Rewrite convoluted physical memory probing.

Delete all of the code working with sp_banks[] and replace
with clean acquisition and sorting of physical memory
parameters from the firmware.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index 7f190fc..5570e7b 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -1333,7 +1333,7 @@
 {
 	unsigned long vaddr = PAGE_OFFSET + paddr;
 
-	if (vaddr > high_memory)
+	if (vaddr > (unsigned long) high_memory)
 		return 0;
 
 	return kern_addr_valid(vaddr);