drm/amd/display: Remove redundant ternary operation

[WHY]
Coverity analysis flagged this ternary operation as
DEADCODE.

Since 'total_y_free_entry' is initialized as 0x200 and
'total_c_free_entry' is initialized as 0x140, and they
never change values before the ternary operator, so
'total_y_free_entry' is always greater 'total_c_free_entry',
'so small_free_entry' is always set to 'total_c_free_entry'.

[HOW]
Replace the ternary operator with the variable declaration.
Signed-off-by: Ivan Lipski <ivlipski@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@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/resource/dcn20/dcn20_resource.c

@@ -1612,7 +1612,7 @@ unsigned int dcn20_calc_max_scaled_time(
 	if (time_per_byte == 0)
 		time_per_byte = 1;
 
-	small_free_entry  = (total_y_free_entry > total_c_free_entry) ? total_c_free_entry : total_y_free_entry;
+	small_free_entry  = total_c_free_entry;
 	max_free_entry    = (mode == PACKED_444) ? total_y_free_entry + total_c_free_entry : small_free_entry;
 	buf_lh_capability = max_free_entry*time_per_byte*32/16; /* there is 4bit fraction */
 	max_scaled_time   = buf_lh_capability - urgent_watermark;