drm/amd/amdgpu/amdgpu_vce: Fix a few incorrectly named functions

drm/amd/amdgpu/amdgpu_vce: Fix a few incorrectly named functions

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

 drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c:98: warning: expecting prototype for amdgpu_vce_init(). Prototype was for amdgpu_vce_sw_init() instead
 drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c:214: warning: expecting prototype for amdgpu_vce_fini(). Prototype was for amdgpu_vce_sw_fini() instead
 drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c:590: warning: expecting prototype for amdgpu_vce_cs_validate_bo(). Prototype was for amdgpu_vce_validate_bo() instead
 drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c:724: warning: expecting prototype for amdgpu_vce_cs_parse(). Prototype was for amdgpu_vce_ring_parse_cs() instead
 drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c:960: warning: expecting prototype for amdgpu_vce_cs_parse_vm(). Prototype was for amdgpu_vce_ring_parse_cs_vm() instead

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>