net: usbnet: Add RM call for request/release of resources

Calls for RM request and release of producer and consumer
resources are missing. RM stats are incorrectly showing
the resource state as released. Hence fix this by calling
request abd release RM APIs upon connect/disconnect.

CRs-Fixed: 875275
Change-Id: I5d5e98f6d300596ec94bc088855902e415a3a039
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>