powerpc: mpc5xxx: remove aev, TB5200 board support

They have not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/board/tqc/tqm5200/Makefile b/board/tqc/tqm5200/Makefile
index 80c1eba..f7c97b7 100644
--- a/board/tqc/tqm5200/Makefile
+++ b/board/tqc/tqm5200/Makefile
@@ -5,4 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y	:= tqm5200.o cmd_stk52xx.o cmd_tb5200.o cam5200_flash.o
+obj-y	:= tqm5200.o cmd_stk52xx.o cam5200_flash.o