usb: gadget: f_gsi: Consolidate ep_intr_num programming

Telematics products require that if both RmNet LTE and RmNet V2X
are enabled in a composition, then configure HW accelerated EPs
for V2X and normal EPs for LTE. Also, If RmNet V2X, ECM and ADPL
are enabled in a composition, configure HW accelerated EPs in
both directions for V2X and IN direction for ECM. Configure
normal EPs for ECM OUT and ADPL.
Add support for the above requirements while maintaining legacy
target features.

Change-Id: Ib15be428849d2a5fe335a9e606f7c6437519e767
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>