ANDROID: usb: gadget: ncm: Introduce vendor opts to deal with ABI breakage

Adding commit [1] to NCM driver essentially breaks the ABI as
it modifies ncm_opts structure by adding max_segment_size variable
to it. Fix this bymoving the newly added variable to a vendor opts
structure.

[1]: https://lore.kernel.org/all/20231221153216.18657-1-quic_kriskura@quicinc.com/



Bug: 341015322
Change-Id: Id1a05847ebc914cbe416b6eeb3aede3b3683bf88
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>