net: usb: ax88179_178a: clean up pm calls

[ Upstream commit 843f9205 ]

Instead of passing in_pm flags all over the place, use the private
struct to handle in_pm mode.

Signed-off-by: Justin Chen <justinpopo6@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: aef05e34 ("net: usb: ax88179_178a: avoid failed operations when device is disconnected")
Signed-off-by: Sasha Levin <sashal@kernel.org>