drm/amd/amdgpu/gmc_v7_0: Fix potential copy/paste issue

Fixes the following W=1 kernel build warning(s):

drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c:526: warning: expecting prototype for gmc_v8_0_set_fault_enable_default(). Prototype was for gmc_v7_0_set_fault_enable_default() instead

Cc: Alex Deucher <[e-mail]>
Cc: "Christian König" <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c

···
 }
 
 /**
- * gmc_v8_0_set_fault_enable_default - update VM fault handling
+ * gmc_v7_0_set_fault_enable_default - update VM fault handling
  *
  * @adev: amdgpu_device pointer
  * @value: true redirects VM faults to the default page