drm/amd/display: Increase number of hpo dp link encoders

[Why]
Number of hpo dp2 link encoders is increased.
Instances are changed.

[How]
Increased size in resource pool, init for each instance
Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Sridevi Arvindekar <sridevi.arvindekar@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/inc/hw/hw_shared.h

@@ -47,7 +47,7 @@
 #define MAX_DIG_LINK_ENCODERS 7
 #define MAX_DWB_PIPES	1
 #define MAX_HPO_DP2_ENCODERS	4
-#define MAX_HPO_DP2_LINK_ENCODERS	2
+#define MAX_HPO_DP2_LINK_ENCODERS	4
 
 struct gamma_curve {
 	uint32_t offset;