net: ipa: Enable checksum for IPA_ENDPOINT_AP_MODEM_{RX,TX} for v4.7

Enable the checksum option for these two endpoints in order to allow
mobile data to actually work. Without this, no packets seem to make it
through the IPA.

Fixes: b310de78 ("net: ipa: add IPA v4.7 support")
Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Alex Elder <elder@riscstar.com>
Link: https://patch.msgid.link/20250227-ipa-v4-7-fixes-v1-3-a88dd8249d8a@fairphone.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>