net: ipa: fix modem LAN RX endpoint id

The endpoint id assigned to the modem LAN RX endpoint for the SC7180 SoC
is incorrect.  The erroneous value might have been copied from SDM845 and
never updated.  The correct endpoint id to use for this SoC is 11.

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