drm/dp: Add definitions for eDP Rev 1.4a and 1.4b

VESA eDP 1.4 specification has separate fields defined in
EDP_DPCD_REV for eDP 1.4a and 1.4b eDP revisions.
This patch defines those. Found this when one of my eDP panels
advertises eDP 1.4a (04h) in the EDP_DPCD_REV DPCD field.

Cc: Jani Nikula <[e-mail]>
Cc: Ville Syrjala <[e-mail]>
Signed-off-by: Manasi Navare <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

include/drm/drm_dp_helper.h

···
 # define DP_EDP_12			    0x01
 # define DP_EDP_13			    0x02
 # define DP_EDP_14			    0x03
+# define DP_EDP_14a                         0x04    /* eDP 1.4a */
+# define DP_EDP_14b                         0x05    /* eDP 1.4b */
 
 #define DP_EDP_GENERAL_CAP_1		    0x701
 # define DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP		(1 << 0)