Revert "defconfig: arm64: Enable bus scaling for kona"

This causes a kernel panic in FBC. Revert until the issue is fixed.

This reverts commit 9262753a.

Change-Id: Ic39bfea1a5de9058676fc25fff4d8580bf9c095e
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>