sandbox: Add 64-bit sandbox

To debug device tree issues involving 32- and 64-bit platforms, it is useful to
have a generic 64-bit platform available.

Add a version of the sandbox that uses 64-bit integers for its physical
addresses as well as a modified device tree.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Added CONFIG_SYS_TEXT_BASE to configs/sandbox64_defconfig
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sandbox/cpu/cpu.c b/arch/sandbox/cpu/cpu.c
index 66c3a6a..4a20fde 100644
--- a/arch/sandbox/cpu/cpu.c
+++ b/arch/sandbox/cpu/cpu.c
@@ -76,7 +76,7 @@
 	if (enable_pci_map && !pci_map_physmem(paddr, &len, &map_dev, &ptr)) {
 		if (plen != len) {
 			printf("%s: Warning: partial map at %x, wanted %lx, got %lx\n",
-			       __func__, paddr, len, plen);
+			       __func__, (uint)paddr, len, plen);
 		}
 		map_len = len;
 		return ptr;