drm/i915: WA for zero memory channel

Commit c457d9cf256e ("drm/i915: Make sure we have enough memory
bandwidth on ICL") assumes that we always have a non-zero
dram_info->channels and uses it as a divisor.
We need num memory channels to be at least 1 for sane bw limits
checking, even when PCode returns 0 or there is a error reading it, so
lets force it to 1 in this case.

Cc: Stanislav Lisovskiy <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Signed-off-by: Daniele Ceraolo Spurio <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>
Signed-off-by: José Roberto de Souza <[email protected]>
Reviewed-by: Clint Taylor <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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