ieee802154: atusb: move to new USB API

Old USB API is prone to uninit value bugs if error handling is not
correct. Let's move atusb to use new USB API to

	1) Make code more simple, since new API does not require memory
	   to be allocates via kmalloc()

	2) Defend driver from usb-related uninit value bugs.

	3) Make code more modern and simple

This patch removes atusb usb wrappers as Greg suggested [0], this will make
code more obvious and easier to understand over time, and replaces old
API calls with new ones.

Also this patch adds and updates usb related error handling to prevent
possible uninit value bugs in future

Link: https://lore.kernel.org/all/YdL0GPxy4TdGDzOO@kroah.com/

 [0]
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>