clk: tegra: dfll: Make symbol 'tegra210_cpu_cvb_tables' static

Fixes the following sparse warning:

drivers/clk/tegra/clk-tegra124-dfll-fcpu.c:244:18: warning:
 symbol 'tegra210_cpu_cvb_tables' was not declared. Should it be static?

Fixes: 2b2dbc2f ("clk: tegra: dfll: add CVB tables for Tegra210")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>