powerpc/prom: Remove limit on maximum size of properties

On a 16TB system (using AMS/CMO), I get:

WARNING: ignoring large property [/ibm,dynamic-reconfiguration-memory] ibm,dynamic-memory length 0x000000000017ffec

and significantly less memory is thus shown to the partition. As far as
I can tell, the constant used is arbitrary. Ben Herrenschmidt provided
additional background that

> The limit was originally set because of Apple machines carrying ROM
> images in the device-tree, at a time where we were much more memory
> constrained than we are now.

and that it is likely not very useful any longer.
Signed-off-by: NNishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/prom_init.c

@@ -47,14 +47,6 @@
 
 #include <linux/linux_logo.h>
 
-/*
- * Properties whose value is longer than this get excluded from our
- * copy of the device tree. This value does need to be big enough to
- * ensure that we don't lose things like the interrupt-map property
- * on a PCI-PCI bridge.
- */
-#define MAX_PROPERTY_LENGTH	(1UL * 1024 * 1024)
-
 /*
  * Eventually bump that one up
  */
@@ -2273,13 +2265,6 @@ static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
 		/* sanity checks */
 		if (l == PROM_ERROR)
 			continue;
-		if (l > MAX_PROPERTY_LENGTH) {
-			prom_printf("WARNING: ignoring large property ");
-			/* It seems OF doesn't null-terminate the path :-( */
-			prom_printf("[%s] ", path);
-			prom_printf("%s length 0x%x\n", RELOC(pname), l);
-			continue;
-		}
 
 		/* push property head */
 		dt_push_token(OF_DT_PROP, mem_start, mem_end);