ARM: tegra: Rename CPU and EMC OPP table device-tree nodes

OPP table name now should start with "opp-table" and OPP entries
shouldn't contain commas and @ signs in accordance to the new schema
requirement. Reorganize CPU and EMC OPP table device-tree nodes.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>