msm: ipa: support GRO feature on msmcobalt

For this GRO feature, IPA-driver should not
de-aggregate the pkt received from modem, also
no need to attach status. Also netmgrd will
call ioctl to wan-driver to indicate when
this feature will be enable.

Change-Id: I1bc6fb87684ee8da6126dc331debf5880adceb4f
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>