drm/amd/display: Check correct bounds for stream encoder instances for DCN303

[Why & How]
eng_id for DCN303 cannot be more than 1, since we have only two
instances of stream encoders.

Check the correct boundary condition for engine ID for DCN303 prevent
the potential out of bounds access.

Fixes: cd6d421e3d1a ("drm/amd/display: Initial DC support for Beige Goby")
Reported-by: Dan Carpenter <[e-mail]>
Cc: [e-mail]
Reviewed-by: Chris Park <[e-mail]>
Reviewed-by: Rodrigo Siqueira <[e-mail]>
Acked-by: Tom Chung <[e-mail]>
Signed-off-by: Aurabindo Pillai <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c

···
 	int afmt_inst;
 
 	/* Mapping of VPG, AFMT, DME register blocks to DIO block instance */
-	if (eng_id <= ENGINE_ID_DIGE) {
+	if (eng_id <= ENGINE_ID_DIGB) {
 		vpg_inst = eng_id;
 		afmt_inst = eng_id;
 	} else