defconfig: enable additional features to automotive

defconfig: Enable CONFIG_NETFILTER_XT_MATCH_BPF

Enable bpf match support for targets with kernel 4.9 and above
so that iptable command from netd (userspace module) with -m bpf
doesn't fail.

defconfig: Enable full reference count validation

Enable full reference count validation to prevent
use-after-free cases and memory leak cases that
may appear because of reference count overflows.

defconfig: sm8150: Enable vmem layout prints

Config option to print kernel virtual memory layout by default
on debug builds.

Change-Id: I5e0cc359851b827821fed07c83eaff239423eee0
Signed-off-by: Hans Chang <hansc@codeaurora.org>