board: config.mk: delete unused sinclude directive

config.tmp is not there.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/board/freescale/m54418twr/config.mk b/board/freescale/m54418twr/config.mk
index b306d03..07f52e0 100644
--- a/board/freescale/m54418twr/config.mk
+++ b/board/freescale/m54418twr/config.mk
@@ -4,6 +4,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-sinclude $(OBJTREE)/board/$(BOARDDIR)/config.tmp
-
 PLATFORM_CPPFLAGS += -DTEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
diff --git a/board/micronas/vct/config.mk b/board/micronas/vct/config.mk
index 0f004e0..354d918 100644
--- a/board/micronas/vct/config.mk
+++ b/board/micronas/vct/config.mk
@@ -8,8 +8,6 @@
 # vct_xxx boards with MIPS 4Kc CPU core
 #
 
-sinclude $(TOPDIR)/board/$(BOARDDIR)/config.tmp
-
 ifndef CONFIG_SYS_TEXT_BASE
 CONFIG_SYS_TEXT_BASE = 0x87000000
 endif