CHROMIUM: arcvm: Enable CHACHA20POLY1305 and XCBC

This enables additional cryptography options for xfrm (IPsec) required
by Android VTS.

This patch is effectively a partial cherry pick of aosp/1371318 for x86.
ARCVM arm64 config already enables these options.

BUG=b:161717358
TEST=all vts_kernel_net_tests testSocketPolicySimple test cases now pass
(chroot) $ cros_workon --board=${BOARD} start arcvm-kernel-ack-5_10
(chroot) $ emerge-$BOARD arcvm-kernel-ack-5_10
(chroot) $ cros deploy <dut_ip> arcvm-kernel-ack-5_10
(tm-dev lunch terminal) $ atest vts_kernel_net_tests

Change-Id: I4c044c654886f3daf3cd5195da525ee5297e01e3
Signed-off-by: Hugo Benichi <hugobenichi@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3831148


Commit-Queue: Sangwhan Moon <sxm@google.com>
Tested-by: Sangwhan Moon <sxm@google.com>
Reviewed-by: Cassie Wang <cassiewang@google.com>
Reviewed-by: Sangwhan Moon <sxm@google.com>
Signed-off-by: Richard Fung <richardfung@google.com>