drm/nouveau/devinit/nv04: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Addresses-Coverity-ID: 143119
Addresses-Coverity-ID: 143120
Addresses-Coverity-ID: 143121
Addresses-Coverity-ID: 143122
Addresses-Coverity-ID: 143123
Addresses-Coverity-ID: 143124
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/nv04.c

@@ -119,11 +119,11 @@ powerctrl_1_shift(int chip_version, int reg)
 
 	switch (reg) {
 	case 0x680520:
-		shift += 4;
+		shift += 4; /* fall through */
 	case 0x680508:
-		shift += 4;
+		shift += 4; /* fall through */
 	case 0x680504:
-		shift += 4;
+		shift += 4; /* fall through */
 	case 0x680500:
 		shift += 4;
 	}
@@ -245,11 +245,11 @@ setPLL_double_highregs(struct nvkm_devinit *init, u32 reg1,
 
 		switch (reg1) {
 		case 0x680504:
-			shift_c040 += 2;
+			shift_c040 += 2; /* fall through */
 		case 0x680500:
-			shift_c040 += 2;
+			shift_c040 += 2; /* fall through */
 		case 0x680520:
-			shift_c040 += 2;
+			shift_c040 += 2; /* fall through */
 		case 0x680508:
 			shift_c040 += 2;
 		}