tegra: Add functions to access low-level Osc/PLL details
Add clock_ll_read_pll() to read PLL parameters and clock_get_osc_bypass() to find out if the Oscillator is bypassed. These are needed by warmboot. Signed-off-by: NSimon Glass <sjg@chromium.org> Signed-off-by: NTom Warren <twarren@nvidia.com>
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