drm/amd/amdgpu/amdgpu_kms: Fix misnaming of parameter 'dev'

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

 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:487: warning: Function parameter or member 'dev' not described in 'amdgpu_info_ioctl'
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:487: warning: Excess function parameter 'adev' description in 'amdgpu_info_ioctl'

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -475,7 +475,7 @@ static int amdgpu_hw_ip_info(struct amdgpu_device *adev,
 /**
  * amdgpu_info_ioctl - answer a device specific request.
  *
- * @adev: amdgpu device pointer
+ * @dev: drm device pointer
  * @data: request object
  * @filp: drm filp
  *