ARM: dts: msm: Add dsp partition in vbmeta parts for apq8053 variants

dsp partition is verity enabled for apq8053 hw variants. Update the
firmware node - vbmeta parts with dsp partition to avoid init or
mount errors.

Change-Id: Ie909e98c79cb5690bf52584b3f5e89fe65e25f57
Signed-off-by: Vijay Navnath Kamble <vkambl@codeaurora.org>