drm/display/dp: Add the remaining Square PHY patterns DPCD register definitions

DP2.1 Specs added new DPCDs definitions for square pattern configs[1]
These new definitions are used for UHBR Source Transmitter
Equalizations tests[2]. Add the 3 new values for square pattern.

v2: rebase

[1]: DP2.1 Specs - 2.12.3.6.5 Square Pattern
[2]: DP2.1 PHY CTS specs - 4.3 UHBR Source Transmitter Equalization

Cc: Jani Nikula <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Lee Shawn C <[email protected]>
Signed-off-by: Khaled Almahallawy <[email protected]>
Reviewed-by: Jani Nikula <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: almahallawy

include/drm/display/drm_dp.h

@@ -651,6 +651,9 @@
 # define DP_LINK_QUAL_PATTERN_PRSBS31       0x38
 # define DP_LINK_QUAL_PATTERN_CUSTOM        0x40
 # define DP_LINK_QUAL_PATTERN_SQUARE        0x48
+# define DP_LINK_QUAL_PATTERN_SQUARE_PRESHOOT_DISABLED                   0x49
+# define DP_LINK_QUAL_PATTERN_SQUARE_DEEMPHASIS_DISABLED                 0x4a
+# define DP_LINK_QUAL_PATTERN_SQUARE_PRESHOOT_DEEMPHASIS_DISABLED        0x4b
 
 #define DP_TRAINING_LANE0_1_SET2	    0x10f
 #define DP_TRAINING_LANE2_3_SET2	    0x110