defconfig: enable memory dump v2 support in 8994 perf config

Enable memory dump v2 driver support in 8994 perf config to allow
crash dump debugging for clients that need this support on perf
config (eg. wlan).

Change-Id: I0443116b6319531e30407af2a0f31d95a2f371c3
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>