Revert "ARM: convert build of appended dtb zImage to list of dtbs"

This reverts commit 5e9468632ea81e7d17fc9bd4457acbaffda7b370.

Tixy was seeing trouble with "make dtbs" and "make my-boards.dtb",
and found reverting this resolves the issue. So for now lets
revert this.

Reported-by: Jon Medhurst (Tixy) <tixy@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2816de7..8468902 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1944,16 +1944,16 @@
 	bool "Build a concatenated zImage/dtb by default"
 	depends on OF
 	help
-	  Enabling this option will cause a concatenated zImage and list of
-	  DTBs to be built by default (instead of a standalone zImage.)
-	  The image will built in arch/arm/boot/zImage-dtb
+	  Enabling this option will cause a concatenated zImage and DTB to
+	  be built by default (instead of a standalone zImage.)  The image
+	  will built in arch/arm/boot/zImage-dtb.<dtb name>
 
-config BUILD_ARM_APPENDED_DTB_IMAGE_NAMES
-	string "Default dtb names"
+config BUILD_ARM_APPENDED_DTB_IMAGE_NAME
+	string "Default dtb name"
 	depends on BUILD_ARM_APPENDED_DTB_IMAGE
 	help
-	  Space separated list of names of dtbs to append when
-	  building a concatenated zImage-dtb.
+	  name of the dtb to append when building a concatenated
+	  zImage/dtb.
 
 # Compressed boot loader in ROM.  Yes, we really want to ask about
 # TEXT and BSS so we preserve their values in the config files.