drm/amd/amdgpu/vcn: Fix kdoc entries for VCN clock/power gating functions

drm/amd/amdgpu/vcn: Fix kdoc entries for VCN clock/power gating functions

This commit corrects the descriptors for the
vcn_v4_0/v4_0_3/v4_0_5/v5_0_0 _set_clockgating_state and
vcn_v4_0/v4_0_3/v4_0_5/v5_0_0 _set_powergating_state functions in the
amdgpu driver.

The parameter descriptors in the comments were mismatched with the
actual function parameters. The non-existent 'handle' parameter has been
replaced with the correct 'ip_block' parameter in the comments to
accurately reflect the function signatures and to resolving the below
with gcc W=1:

drivers/gpu/drm/amd/amdgpu/vcn_v5_0_0.c:1232: warning: Function parameter or struct member 'ip_block' not described in 'vcn_v5_0_0_set_clockgating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v5_0_0.c:1232: warning: Excess function parameter 'handle' description in 'vcn_v5_0_0_set_clockgating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v5_0_0.c:1263: warning: Function parameter or struct member 'ip_block' not described in 'vcn_v5_0_0_set_powergating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v5_0_0.c:1263: warning: Excess function parameter 'handle' description in 'vcn_v5_0_0_set_powergating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c:2012: warning: Function parameter or struct member 'ip_block' not described in 'vcn_v4_0_set_clockgating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c:2012: warning: Excess function parameter 'handle' description in 'vcn_v4_0_set_clockgating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c:2043: warning: Function parameter or struct member 'ip_block' not described in 'vcn_v4_0_set_powergating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c:2043: warning: Excess function parameter 'handle' description in 'vcn_v4_0_set_powergating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v4_0_5.c:1505: warning: Function parameter or struct member 'ip_block' not described in 'vcn_v4_0_5_set_clockgating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v4_0_5.c:1505: warning: Excess function parameter 'handle' description in 'vcn_v4_0_5_set_clockgating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v4_0_5.c:1536: warning: Function parameter or struct member 'ip_block' not described in 'vcn_v4_0_5_set_powergating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v4_0_5.c:1536: warning: Excess function parameter 'handle' description in 'vcn_v4_0_5_set_powergating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v4_0_3.c:1629: warning: Function parameter or struct member 'ip_block' not described in 'vcn_v4_0_3_set_powergating_state'
drivers/gpu/drm/amd/amdgpu/vcn_v4_0_3.c:1629: warning: Excess function parameter 'handle' description in 'vcn_v4_0_3_set_powergating_state'

Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>