gpu: drm: replace occurrences of invalid character

There are some places at drm that ended receiving a
REPLACEMENT CHARACTER U+fffd ('�'), probably because of
some bad charset conversion.

Fix them by using what it seems	to be the proper
character.
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/e606930c73029f16673849c57acac061dd923866.1621412009.git.mchehab+huawei@kernel.org

drivers/gpu/drm/amd/include/atombios.h

@@ -5178,11 +5178,11 @@ typedef struct  _ATOM_LEAKAGE_VOLTAGE_OBJECT_V3
 typedef struct  _ATOM_SVID2_VOLTAGE_OBJECT_V3
 {
    ATOM_VOLTAGE_OBJECT_HEADER_V3 sHeader;    // voltage mode = VOLTAGE_OBJ_SVID2
-// 14:7 � PSI0_VID
-// 6 � PSI0_EN
-// 5 � PSI1
-// 4:2 � load line slope trim.
-// 1:0 � offset trim,
+// 14:7 - PSI0_VID
+// 6 - PSI0_EN
+// 5 - PSI1
+// 4:2 - load line slope trim.
+// 1:0 - offset trim,
    USHORT   usLoadLine_PSI;
 // GPU GPIO pin Id to SVID2 regulator VRHot pin. possible value 0~31. 0 means GPIO0, 31 means GPIO31
    UCHAR    ucSVDGpioId;     //0~31 indicate GPIO0~31

drivers/gpu/drm/i915/gt/intel_gpu_commands.h

 /* SPDX-License-Identifier: MIT*/
 /*
- * Copyright � 2003-2018 Intel Corporation
+ * Copyright © 2003-2018 Intel Corporation
  */
 
 #ifndef _INTEL_GPU_COMMANDS_H_

drivers/gpu/drm/i915/i915_gpu_error.h

 /*
  * SPDX-License-Identifier: MIT
  *
- * Copyright � 2008-2018 Intel Corporation
+ * Copyright © 2008-2018 Intel Corporation
  */
 
 #ifndef _I915_GPU_ERROR_H_

drivers/gpu/drm/r128/r128_drv.h

@@ -29,7 +29,7 @@
  *    Rickard E. (Rik) Faith <faith@valinux.com>
  *    Kevin E. Martin <martin@valinux.com>
  *    Gareth Hughes <gareth@valinux.com>
- *    Michel D�zer <daenzerm@student.ethz.ch>
+ *    Michel Dänzer <daenzerm@student.ethz.ch>
  */
 
 #ifndef __R128_DRV_H__