net: ipa: make endpoint data validation unconditional

The cost of validating the endpoint configuration data is not all
that high, so just do it unconditionally, rather than doing so only
when IPA_VALIDATAION is defined.

Suggested-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>