drm/msm/dpu: initialise clk_rate to 0 in _dpu_core_perf_get_core_clk_rate

When removing the core perf tune overrides, I also occasionaly removed the
initialisation of the clk_rate variable. Initialise it to 0 to let max()
correctly calculate the maximum of requested clock rates.

Reported-by: Dan Carpenter <[email protected]>
Fixes: 6a4bc73915af ("drm/msm/dpu: drop separate dpu_core_perf_tune overrides")
Signed-off-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Abhinav Kumar <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/551321/
Link: https://lore.kernel.org/r/[email protected]

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