arm64: defconfig: remove configs to fix kw issues

Remove CONFIG_ATL1C and CONFIG_QCOM_EMAC which are causing the KW
issues. These configs are anyway not required for any functionality
for SVM.

Change-Id: I64ecdda547760a00936e3cf9cbfc98cb24d6f39c
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>