drm/amd/swsmu: remove duplicate definition of smu v14_0_0 driver if version

There is a repeated define of smu v14_0_0 driver if version, so delete
one in driver if header.

Signed-off-by: Li Ma <li.ma@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>