image_type_tezi.bbclass: use IMAGE_BOOT_FILES to deploy boot files

The changes include:
- Introduce tezi_deploy_files helper function, it could be used to
  install files listed in IMAGE_BOOT_FILES, the install logic is same
  with how WIC handle IMAGE_BOOT_FILES.
- Use WKS_FILE_DEPENDS to handle the dependencies of do_image_teziimg
  and do_image_teziimg_distro, when USING_WIC is not set, then we need
  add WKS_FILE_DEPENDS to DEPENDS, or else it would be done in wic
  image bbclass.
- Drop TEZI_KERNEL_IMAGETYPE and TEZI_KERNEL_DEVICETREE, now all the
  boot files would be controlled by IMAGE_BOOT_FILES.
- Use ${IMAGE_LINK_NAME} instead of ${IMAGE_NAME}, to avoid including
  DATETIME for torizon builds.

Patch has been verified on the following machines, the artifacts
generated with and wihtout the patch are identical:
- apalis-imx6
- apalis-imx8
- apalis-tk1
- apalis-tk1-mainline
- colibri-imx6
- colibri-imx6ull
- colibri-imx7
- colibri-imx8x

Signed-off-by: Ming Liu <ming.liu@toradex.com>

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