wic/bootimg-efi: IMAGE_EFI_BOOT_FILES variable added to separate bootimg-efi and bootimg-partition

Due to recent changes in bootimg-efi to include IMAGE_BOOT_FILES,
when both bootimg-partition and bootimg-efi occur in a single .wks
and IMAGE_BOOT_FILES are defined, files listed in IMAGE_BOOT_FILES
will be duplicated in both partition.
Since IMAGE_BOOT_FILES are crucial for bootimg-partition, but
optional for bootimg-efi, hence allowing bootimg-efi to have the option
to ignore it.

The new variable, IMAGE_EFI_BOOT_FILES, was added to help handle this
issue. Its basic usage is the same as IMAGE_BOOT_FILES.
Usage example:
        ${IMGDEPLOYDIR}/${IMAGE_BASENAME}-${MACHINE}.ext4;rootfs.img \

This commit is also squashed with the updated testcase to cover for
this change.

[YOCTO #14011]

(From OE-Core rev: 945339e06b273df1935cfd784f548ef57e0b7f4c)

Signed-off-by: Khairul Rohaizzat Jamaluddin <khairul.rohaizzat.jamaluddin@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/wic.py

@@ -235,6 +235,17 @@ class Wic(WicTestCase):
         runCmd(cmd)
         self.assertEqual(1, len(glob(self.resultdir + "systemd-bootdisk-*direct")))
 
+    def test_efi_bootpart(self):
+        """Test creation of efi-bootpart image"""
+        cmd = "wic create mkefidisk -e core-image-minimal -o %s" % self.resultdir
+        kimgtype = get_bb_var('KERNEL_IMAGETYPE', 'core-image-minimal')
+        self.append_config('IMAGE_EFI_BOOT_FILES = "%s;kernel"\n' % kimgtype)
+        runCmd(cmd)
+        sysroot = get_bb_var('RECIPE_SYSROOT_NATIVE', 'wic-tools')
+        images = glob(self.resultdir + "mkefidisk-*.direct")
+        result = runCmd("wic ls %s:1/ -n %s" % (images[0], sysroot))       
+        self.assertIn("kernel",result.output)
+
     def test_sdimage_bootpart(self):
         """Test creation of sdimage-bootpart image"""
         cmd = "wic create sdimage-bootpart -e core-image-minimal -o %s" % self.resultdir
@@ -689,7 +700,7 @@ class Wic2(WicTestCase):
         wicvars = wicvars.difference(('DEPLOY_DIR_IMAGE', 'IMAGE_BOOT_FILES',
                                       'INITRD', 'INITRD_LIVE', 'ISODIR','INITRAMFS_IMAGE',
                                       'INITRAMFS_IMAGE_BUNDLE', 'INITRAMFS_LINK_NAME',
-                                      'APPEND'))
+                                      'APPEND', 'IMAGE_EFI_BOOT_FILES'))
         with open(path) as envfile:
             content = dict(line.split("=", 1) for line in envfile)
             # test if variables used by wic present in the .env file