Add .esimximg and .esimximg.dek targets for signed and encrypted
images and their corresponding DEKs. Also add rule to generate final
.img.dek files.

As an example, adding encrypted images for imx6ull_evk would look like
this:

  FILE_barebox-nxp-imx6ull-evk-encrypted.img = 
start_nxp_imx6ull_evk.pblx.esimximg
  image-$(CONFIG_MACH_NXP_IMX6ULL_EVK) += barebox-nxp-imx6ull-evk-encrypted.img

  FILE_barebox-nxp-imx6ull-evk-encrypted.img.dek = 
start_nxp_imx6ull_evk.pblx.esimximg.dek
  image-$(CONFIG_MACH_NXP_IMX6ULL_EVK) += 
barebox-nxp-imx6ull-evk-encrypted.img.dek

Signed-off-by: Marcin Niestroj <[email protected]>
---
Changes rfc -> v1:
 * Add Makefile rule for .dek files

 images/Makefile.imx | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/images/Makefile.imx b/images/Makefile.imx
index aefc52af4..156eb6478 100644
--- a/images/Makefile.imx
+++ b/images/Makefile.imx
@@ -20,6 +20,14 @@ $(obj)/%.simximg: $(obj)/% FORCE
 $(obj)/%.usimximg: $(obj)/% FORCE
        $(call if_changed,imx_image,$(CFG_$(patsubst 
%.usimximg,%.imximg,$(@F))),-s -u)
 
+$(obj)/%.esimximg $(obj)/%.esimximg.dek: $(obj)/% FORCE
+       $(call if_changed,imx_image,$(CFG_$(patsubst 
%.esimximg,%.imximg,$(@F))),-s -e)
+
+.SECONDEXPANSION:
+$(obj)/%.img.dek: $(obj)/$$(FILE_$$(@F))
+       $(Q)if [ -z $(FILE_$(@F)) ]; then echo "FILE_$(@F) empty!"; false; fi
+       $(call if_changed,shipped)
+
 quiet_cmd_imx_sram_img ?= IMX-SRAM-IMG    $@
       cmd_imx_sram_img ?= cat $(obj)/$(patsubst %.imx-sram-img,%.pblb,$(2)) > 
$@; \
                  $(call size_append, $(obj)/barebox.z) >> $@; \
-- 
2.18.0


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