clk: tegra: add locking to periph clks

Tegra124 has periph clocks which share the hw register. Hence locking is
required.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --cc drivers/clk/tegra/clk-tegra-periph.c
Simple merge

diff --cc drivers/clk/tegra/clk.h
Simple merge