net: ipa: FLAVOR_0 register doesn't exist until IPA v3.5

The FLAVOR_0 version first appears in IPA v3.5, so avoid attempting
to read it for versions prior to that.

This register contains a concise definition of the number and
direction of endpoints supported by the hardware, and without it
we can't verify endpoint configuration in ipa_endpoint_config().
In this case, just indicate that any endpoint number is available
for use.

Originally proposed by AngeloGioacchino Del Regno.

Link: https://lore.kernel.org/netdev/[email protected]
Signed-off-by: Alex Elder <[email protected]>
Acked-by: AngeloGioacchino Del Regno
Signed-off-by: David S. Miller <[email protected]>

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