trivial: Fix incorrect ring setup in ethdrivers

Both intel and tx2 drivers incorrectly configured the amount of
descriptors in the rings slightly.

ethdrivers, intel: Fill rx buffers early in poll

If filling rx buffers had previously failed due to no available buffers,
then try and refill again the next time poll is called to minimize
dropping packets.

libethdrivers: Update tx2 and intel drivers

Add a new initialization mechanism for drivers to allocate their own
resources that use the driver framework interfaces.

trivial: Fixed style

pc99: Allow user to configure promiscuous mode

Remove the hardcoded promiscuous mode configuration and
allow user to make decision.

pc99: Add function for getting MAC addr

Add get_mac function to raw_iface_funcs so Ethdriver
components can get device MAC address

libethdrivers: include config of lwip and picotcp

since global autoconf is removed, we need to explicitly
include the config of lwip and picotcp which will further
indicate the existance of corresponding lib

Fix whitespace

- remove trailing whitespace
- remove duplicate blank lines
- remove blank lines at end of file

Change 1 << * to BIT(*) in some cases

fix licenses

libethdrivers: Support 64-bit physical addresses in intel driver

libethdrivers: Force constant to be 32-bit type