drm/amd/pm: remove dead code in navi10_emit_clk_levels and navi10_print_clk_levels

Since the range of the varibable i is 0 - 3.
So execution cannot reach this statement: default.
Signed-off-by: Jesse Zhang <Jesse.Zhang@amd.com>
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Tim Huang <Tim.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c

@@ -1389,8 +1389,6 @@ static int navi10_emit_clk_levels(struct smu_context *smu,
 			case 2:
 				curve_settings = &od_table->GfxclkFreq3;
 				break;
-			default:
-				break;
 			}
 			*offset += sysfs_emit_at(buf, *offset, "%d: %uMHz %umV\n",
 						  i, curve_settings[0],
@@ -1594,8 +1592,6 @@ static int navi10_print_clk_levels(struct smu_context *smu,
 			case 2:
 				curve_settings = &od_table->GfxclkFreq3;
 				break;
-			default:
-				break;
 			}
 			size += sysfs_emit_at(buf, size, "%d: %uMHz %umV\n",
 					      i, curve_settings[0],