Add cases for asics with 3 and 5 crtcs.  Fixes an artificial
limitation on asics with 3 or 5 crtcs.
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=99744
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
        default:
                encoder->possible_crtcs = 0x3;
                break;
+       case 3:
+               encoder->possible_crtcs = 0x7;
+               break;
        case 4:
                encoder->possible_crtcs = 0xf;
                break;
+       case 5:
+               encoder->possible_crtcs = 0x1f;
+               break;
        case 6:
                encoder->possible_crtcs = 0x3f;
                break;