capsule: Makefile: add the generated files to CLEAN_FILES list

A certain set of capsule files are now generated as part of the
sandbox build. Add these files to the CLEAN_FILES list for deletion on
invoking any of the cleanup targets.

Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canoncal.com>
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
diff --git a/Makefile b/Makefile
index 5d28595..ba66097 100644
--- a/Makefile
+++ b/Makefile
@@ -2199,7 +2199,8 @@
 	       mkimage-out.spl.mkimage mkimage.spl.mkimage imx-boot.map \
 	       itb.fit.fit itb.fit.itb itb.map spl.map mkimage-out.rom.mkimage \
 	       mkimage.rom.mkimage mkimage-in-simple-bin* rom.map simple-bin* \
-	       idbloader-spi.img lib/efi_loader/helloworld_efi.S *.itb
+	       idbloader-spi.img lib/efi_loader/helloworld_efi.S *.itb \
+	       Test* capsule.*.efi-capsule capsule*.map
 
 # Directories & files removed with 'make mrproper'
 MRPROPER_DIRS  += include/config include/generated spl tpl vpl \