drm/i915/: Initialise trans_min for skl_compute_transition_wm()

clang spots

drivers/gpu/drm/i915/intel_pm.c:4655:6: warning: variable 'trans_min' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
        if (INTEL_GEN(dev_priv) >= 10)

but fortunately for us we skip the function unless on a gen10+ device.
However, to keep the function generic in case we do want to re-enable it
for gen9 again, initialise trans_min to 0.

References: ca47667f523e ("drm/i915/gen10: Calculate and enable transition WM")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Mahesh Kumar <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Rodrigo Vivi <[email protected]>

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