DP controller can be setup to operate in either SDP update flush mode or
peripheral flush mode based on the DP controller hardware version.

Starting in DP v1.2, the hardware documents require the use of
peripheral flush mode for SDP packets such as PPS OR VSC SDP packets.

In-line with this guidance, lets program the DP controller to use
peripheral flush mode starting DP v1.2

Changes in v4:
	- Clear up that DP_MAINLINK_CTRL_FLUSH_MODE register requires
	  the use of bits [24:23]
	- Modify macros DP_MAINLINK_FLUSH_MODE_UPDATE_SDP and
	  DP_MAINLINK_FLUSH_MODE_SDP_PERIPH_UPDATE to explicitly set
	  their values in the bits of DP_MAINLINK_CTRL_FLUSH_MODE_MASK

Changes in v3:
	- Clear up that the DP_MAINLINK_FLUSH_MODE_SDE_PERIPH_UPDATE
	  macro is setting bits [24:23] to a value of 3

Changes in v2:
	- Use the original dp_catalog_hw_revision() function to
	  correctly check the DP HW version
Signed-off-by: Paloma Arellano <quic_parellan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/579621/
Link: https://lore.kernel.org/r/20240222194025.25329-16-quic_parellan@quicinc.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>