tegra21: dvfs: Ignore chip revision for Shield SKU

tegra21: dvfs: Ignore chip revision for Shield SKU

Bug 1558421

Change-Id: If6ff68424cf066837316abf47b44289e3c90e2c3
Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-on: http://git-master/r/924475
Reviewed-by: Kerwin Wan <kerwinw@nvidia.com>
Reviewed-by: Mitch Luban <mluban@nvidia.com>
Reviewed-on: http://git-master/r/928843
Reviewed-by: Hayden Du <haydend@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: Ishwarya Balaji Gururajan <igururajan@nvidia.com>
Reviewed-by: Vinayak Pane <vpane@nvidia.com>
Reviewed-by: Anshul Jain (SW) <anshulj@nvidia.com>
Tested-by: Anshul Jain (SW) <anshulj@nvidia.com>