ARM: tegra: ardbeg: add power monitor devices for TN8

ARM: tegra: ardbeg: add power monitor devices for TN8

- power monitor devices are different on tn8 and Shield ERS
- use board_info to get soc sku version and based on that register
devices specific to tn8

Change-Id: I348f665e3a7c61be06df70d1bfeec4432a049d8c
Signed-off-by: Timo Alho <talho@nvidia.com>
Signed-off-by: Pradeep Goudagunta <pgoudagunta@nvidia.com>
Reviewed-on: http://git-master/r/299437
Reviewed-by: Seema Khowala <seemaj@nvidia.com>
Tested-by: Seema Khowala <seemaj@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Mitch Luban <mluban@nvidia.com>