ANDROID: GKI: Convert USB network adpaters to modules

Converts these config items from built-in to GKI protected
modules:

CONFIG_USB_NET_DRIVERS
CONFIG_USB_USBNET
CONFIG_USB_RTL8150
CONFIG_USB_RTL8152
CONFIG_USB_NET_AX8817X
CONFIG_USB_NET_AX88179_178A
CONFIG_USB_NET_CDCETHER
CONFIG_USB_NET_CDC_EEM
CONFIG_USB_NET_CDC_NCM
CONFIG_USB_NET_AQC111
CONFIG_USB_RTL8153_ECM

Bug: 232431151
Bug: 279972445
Test: TH
Change-Id: I8a6e34be1ed86a8ea1d44e6721954fb5888e1fa4
Signed-off-by: Ramji Jiyani <ramjiyani@google.com>