drm/msm/dpu: drop bus_scaling_client field

We do not use MSM bus client, so drop bus_scaling_client field from
dpu_encoder_virt.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220217035358.465904-5-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -127,7 +127,6 @@ enum dpu_enc_rc_states {
  *	Virtual encoder registers itself with the DRM Framework as the encoder.
  * @base:		drm_encoder base class for registration with DRM
  * @enc_spinlock:	Virtual-Encoder-Wide Spin Lock for IRQ purposes
- * @bus_scaling_client:	Client handle to the bus scaling interface
  * @enabled:		True if the encoder is active, protected by enc_lock
  * @num_phys_encs:	Actual number of physical encoders contained.
  * @phys_encs:		Container of physical encoders managed.
@@ -172,7 +171,6 @@ enum dpu_enc_rc_states {
 struct dpu_encoder_virt {
 	struct drm_encoder base;
 	spinlock_t enc_spinlock;
-	uint32_t bus_scaling_client;
 
 	bool enabled;