Flush mechanism for DSPP blocks has changed in sc7280 family, it
allows individual sub blocks to be flushed in coordination with
master flush control.

Representation: master_flush && (PCC_flush | IGC_flush .. etc )

This change adds necessary support for the above design.

Changes in v1:
- Few nits (Doug, Dmitry)
- Restrict sub-block flush programming to dpu_hw_ctl file (Dmitry)

Changes in v2:
- Move the address offset to flush macro (Dmitry)
- Separate ops for the sub block flush (Dmitry)

Changes in v3:
- Reuse the DPU_DSPP_xx enum instead of a new one (Dmitry)

Changes in v4:
- Use shorter version for unsigned int (Stephen)

Changes in v5:
- Spurious patch please ignore.

Changes in v6:
- Add SOB tag (Doug, Dmitry)

Changes in v7:
- Cache flush mask per dspp (Dmitry)
- Few nits (Marijn)

Changes in v8:
- Few nits (Marijn)

Changes in v9:
- Use DSPP enum while accessing flush mask to make it readable (Dmitry)
- Few nits (Dmitry)

Changes in v10:
- Fix white spaces in a separate patch (Dmitry)

Changes in v11:
- Define a macro for dspp flush selection (Marijn)
- Few nits (Marijn)

Changes in v12:
- Minor comments (reorder macros and a condition) (Marijn)
Signed-off-by: Kalyan Thota <quic_kalyant@quicinc.com>
Tested-by: Douglas Anderson <dianders@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/520701/
Link: https://lore.kernel.org/r/1674814487-2112-1-git-send-email-quic_kalyant@quicinc.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>