clk: tegra: periph: Make tegra_clk_periph_ops static

Reduce symbol visibility by converting tegra_clk_periph_ops to static.
Removed the extern declaration from clk.h as the symbol is now locally
scoped to clk-periph.c.

Signed-off-by: Pei Xiao <xiaopei01@kylinos.cn>
Link: https://lore.kernel.org/r/bda59ad46afae6e7484edf8e2f7bf23ceafe51e9.1752046270.git.xiaopei01@kylinos.cn


Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>