libfdt: Sync up with upstream

This includes small changes to the following functions, from upstream
commit 6d1832c:

- fdt_get_max_phandle() (upstream commit 84e0e134)
- fdt_node_check_compatible (upstream commit 53bf130b)
- fdt_setprop_inplace_namelen_partial() to remove useless brackets and
     use idx instead of index
- _fdt_resize_property() to use idx instead of index
- _fdt_splice() (upstream commit d4c7c25c)

It also includes various typo fixes in libfdt.h

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/libfdt/fdt_wip.c b/lib/libfdt/fdt_wip.c
index 216c512..45fb964 100644
--- a/lib/libfdt/fdt_wip.c
+++ b/lib/libfdt/fdt_wip.c
@@ -16,7 +16,7 @@
 
 int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
 					const char *name, int namelen,
-					uint32_t index, const void *val,
+					uint32_t idx, const void *val,
 					int len)
 {
 	void *propval;
@@ -27,10 +27,10 @@
 	if (!propval)
 		return proplen;
 
-	if (proplen < (len + index))
+	if (proplen < (len + idx))
 		return -FDT_ERR_NOSPACE;
 
-	memcpy(propval + index, val, len);
+	memcpy((char *)propval + idx, val, len);
 	return 0;
 }