Makefile: let clean remove capsule_in.capsule*.efi-capsule

Update the CLEAN_FILES list to remove capsule*.*.efi-capsule.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/Makefile b/Makefile
index 0500eb6..70d74e2 100644
--- a/Makefile
+++ b/Makefile
@@ -2218,7 +2218,7 @@
 	       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 \
-	       Test* capsule.*.efi-capsule capsule*.map
+	       Test* capsule*.*.efi-capsule capsule*.map
 
 # Directories & files removed with 'make mrproper'
 MRPROPER_DIRS  += include/config include/generated spl tpl vpl \