usb: gadget: Implement ECM over IPA

Add bam transport parameter for u_bam_data interface to
support two types of data transfer - over bam2bam and over ipa.
Add required calls for ecm_ipa driver which will handle the
transfer of data over IPA.

Change-Id: I3fd73b159676f5475c527bf52208533e65dddb1d
Signed-off-by: Anna Perel <aperel@codeaurora.org>
Signed-off-by: Amit Blay <ablay@codeaurora.org>
8 files changed