Revert RMC modem stack

This driver is unused, and effectively forks the kernel networking ABIs
by adding proprietary ETH_ and AF_ constants.

This fixes the net/socket.c kernel selftest on Nexus 9.

This reverts the following commits:

b49be5c net: mhi  mhi_dgram  Fix warning messages
1968247 net: mhi:  Fix compiler warnings
edb4f6d fixup! net: Add MHI support for RMC PegaPCI. * As submitted by RMC for modem support *
525d3d2 net: mhi: mhdp optimizations and typo corrections
ca8a7d4 net: mhi: Remove keep alive feature in MHDP
33fa001 net: mhi: mhdp support for bonding
bb277c0 net: mhi: mhdp keep alive feature is not required
8e35c4e net: mhi: reduce MAX_MHDPHDR_SIZE
54c1fa4 net: Add MHI support for RMC PegaPCI. * As submitted by RMC for modem support *
67c2382 drivers: net: Modifications for RMC PegaPCI. * As submitted by RMC for modem support *

Change-Id: If8d9803444f9091b6ee4167f36d847f211535ef1
Signed-off-by: Greg Hackmann <ghackmann@google.com>
27 files changed