binman: Drop unnecessary 'type' property in tests

A few tests declare a type when this can be inferred from the node name.
Drop these lines, since it might cause confusion.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/test/149_symbols_tpl.dts b/tools/binman/test/149_symbols_tpl.dts
index dfc84af..0a4ab3f 100644
--- a/tools/binman/test/149_symbols_tpl.dts
+++ b/tools/binman/test/149_symbols_tpl.dts
@@ -21,7 +21,6 @@
 
 		section {
 			u-boot-tpl {
-				type = "u-boot-tpl";
 			};
 		};
 	};
diff --git a/tools/binman/test/155_symbols_tpl_x86.dts b/tools/binman/test/155_symbols_tpl_x86.dts
index 72ca447..9d7dc51 100644
--- a/tools/binman/test/155_symbols_tpl_x86.dts
+++ b/tools/binman/test/155_symbols_tpl_x86.dts
@@ -24,7 +24,6 @@
 
 		section {
 			u-boot-tpl {
-				type = "u-boot-tpl";
 			};
 		};
 	};