u-boot-distro-boot: some clean up

- Inherit nopackages since it does not generate any non-empty packages.
- Drop do_compile, we can run mkimage directly in do_deploy task.
- Drop 'S = "${WORKDIR}"', we do not have to explicitly set it, the
  default S would be good enough.
- Do not install DEPLOYDIR, that is not necessary, it's already done
  in deploy.bbclass.
- Do not set noexec flag to do_install, do_populate_sysroot, they are
  basically empty tasks, making do_populate_sysroot noexec also will
  cause QA warning when u-boot-distro-boot is set to DEPENDS in other
  recipes.

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

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