drm/amd/amdgpu/amdgpu_device: Provide documentation for 'reg_addr' params

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

 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:594: warning: Function parameter or member 'reg_addr' not described in 'amdgpu_device_indirect_rreg'
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:624: warning: Function parameter or member 'reg_addr' not described in 'amdgpu_device_indirect_rreg64'

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: Sumit Semwal <sumit.semwal@linaro.org>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.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_device.c

@@ -585,6 +585,7 @@ void amdgpu_mm_wdoorbell64(struct amdgpu_device *adev, u32 index, u64 v)
  * @adev: amdgpu_device pointer
  * @pcie_index: mmio register offset
  * @pcie_data: mmio register offset
+ * @reg_addr: indirect register address to read from
  *
  * Returns the value of indirect register @reg_addr
  */
@@ -615,6 +616,7 @@ u32 amdgpu_device_indirect_rreg(struct amdgpu_device *adev,
  * @adev: amdgpu_device pointer
  * @pcie_index: mmio register offset
  * @pcie_data: mmio register offset
+ * @reg_addr: indirect register address to read from
  *
  * Returns the value of indirect register @reg_addr
  */