defconfig: arm64: disable jtagv8 config from perf builds

jtagv8 drivers are used to save and restore of Debug and ETM
registers across low power modes. ETM functionality is disabled
from perf builds. Disable jtagv8 drivers as well from perf
builds.

Change-Id: Ic59cef84462a87e8ac4ae7506a39429b13eae08b
Signed-off-by: Sarangdhar Joshi <spjoshi@codeaurora.org>