Build: move cert_create arguments and dependency to FIP_ADD_PAYLOAD

The fiptool and cert_create use the same command options for images.
It is pretty easy to handle both in the same, symmetrical way.

Move CRT_ARGS and CRT_DEPS to FIP_ADD_PAYLOAD.  This refactoring makes
sense because FIP_ADD_PAYLOAD is called from MAKE_BL (when building
images from source), and from FIP_ADD_IMG (when including external
images).  (FIP_ADD_PAYLOAD will be renamed later on since it now
caters to both fiptool and cert_create).

We can delete CERT_ADD_CMD_OPT for images in tbbr.mk.  It still
needs to call CERT_ADD_CMD_OPT directly for certificates.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index 85e575c..e0d107f 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -107,6 +107,8 @@
 define FIP_ADD_PAYLOAD
     $(4)FIP_ARGS += $(2) $(1)
     $(if $(3),$(4)FIP_DEPS += $(3))
+    $(4)CRT_ARGS += $(2) $(1)
+    $(if $(3),$(4)CRT_DEPS += $(3))
 endef
 
 # CERT_ADD_CMD_OPT adds a new command line option to the cert_create invocation