drm/amdgpu: Fix build warnings

Fix header guard and make internal functions static. Fixes the below warnings:

drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu_reset.h:24:9: warning: '__AMDUGPU_RESET_H__' is used as a header guard here, followed by #define of a different macro [-Wheader-guard]
drivers/gpu/drm/amd/amdgpu/aldebaran.c:110:6: warning: no previous prototype for function 'aldebaran_async_reset' [-Wmissing-prototypes]
drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/aldebaran_ppt.c:1435:5: warning: no previous prototype for function 'aldebaran_mode2_reset' [-Wmissing-prototypes]

Signed-off-by: Lijo Lazar <[e-mail]>
Reported-by: kernel test robot <[e-mail]>
Reviewed-by: Hawking Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/aldebaran.c

···
 	return r;
 }
 
-void aldebaran_async_reset(struct work_struct *work)
+static void aldebaran_async_reset(struct work_struct *work)
 {
 	struct amdgpu_reset_handler *handler;
 	struct amdgpu_reset_control *reset_ctl =

drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h

···
  *
  */
 
-#ifndef __AMDUGPU_RESET_H__
+#ifndef __AMDGPU_RESET_H__
 #define __AMDGPU_RESET_H__
 
 #include "amdgpu.h"

drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c

···
 	return sizeof(struct gpu_metrics_v1_1);
 }
 
-int aldebaran_mode2_reset(struct smu_context *smu)
+static int aldebaran_mode2_reset(struct smu_context *smu)
 {
 	u32 smu_version;
 	int ret = 0, index;