clk: tegra: dfll: build clk-dfll.c for Tegra124 and Tegra210

Tegra210 has a DFLL as well and can share the majority of the code with
the Tegra124 implementation. So build the same code for both platforms.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>