msm: ipa: Fix using generic name for offload connect/disconnect

ECM_CONNECT/ECM_DISCONNECT name looks specific to ECM offload
scenarios. As IPA supports other peripherals like ETH/AQC/RNDIS
use a more generic name.

Change-Id: I09bb640734f2ea0bf2d47ed95d03290db50b5770
Signed-off-by: Chaitanya Pratapa <cpratapa@codeaurora.org>