dtc: give advance warning that "-S" is going away.

The "-S" option allowed the specification of a minimum size for
the blob, however the main reason for caring about the size is
so there is enough padding to add a chosen node by u-boot or
whoever.  In which case, folks don't really care about the absolute
size, but rather the size of the padding added for this -- which
is what the "-p" option does.  Having the "-S" just confuses people.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

dtc.c

@@ -182,6 +182,9 @@ int main(int argc, char *argv[])
 	if (minsize && padsize)
 		die("Can't set both -p and -S\n");
 
+	if (minsize)
+		fprintf(stderr, "DTC: Use of \"-S\" is deprecated; it will be removed soon, use \"-p\" instead\n");
+
 	fprintf(stderr, "DTC: %s->%s  on file \"%s\"\n",
 		inform, outform, arg);