drm/amd/display: do not compare integers of different widths

[Why & How]
Increase width of some variables to avoid comparing integers of
different widths

Tested-by: Daniel Wheeler <[e-mail]>
Reviewed-by: Anthony Koo <[e-mail]>
Acked-by: Rodrigo Siqueira <[e-mail]>
Signed-off-by: Josip Pavic <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/core/dc_link.c

···
 void dc_get_cur_link_res_map(const struct dc *dc, uint32_t *map)
 {
 	struct dc_link *link;
-	uint8_t i;
+	uint32_t i;
 	uint32_t hpo_dp_recycle_map = 0;
 
 	*map = 0;
···
 void dc_restore_link_res_map(const struct dc *dc, uint32_t *map)
 {
 	struct dc_link *link;
-	uint8_t i;
+	uint32_t i;
 	unsigned int available_hpo_dp_count;
 	uint32_t hpo_dp_recycle_map = (*map & LINK_RES_HPO_DP_REC_MAP__MASK)
 			>> LINK_RES_HPO_DP_REC_MAP__SHIFT;