accel/qaic: Remove the description of DRM_IOCTL_QAIC_PART_DEV

The partition device ioctl was removed during the development of the
initial version of qaic driver. Remove its description from the
documentation to avoid confusing readers.
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240716073036.453-1-yuzenghui@huawei.com

Documentation/accel/qaic/qaic.rst

@@ -147,12 +147,6 @@ DRM_IOCTL_QAIC_PERF_STATS_BO
   recent execution of a BO. This allows userspace to construct an end to end
   timeline of the BO processing for a performance analysis.
 
-DRM_IOCTL_QAIC_PART_DEV
-  This IOCTL allows userspace to request a duplicate "shadow device". This extra
-  accelN device is associated with a specific partition of resources on the
-  AIC100 device and can be used for limiting a process to some subset of
-  resources.
-
 DRM_IOCTL_QAIC_DETACH_SLICE_BO
   This IOCTL allows userspace to remove the slicing information from a BO that
   was originally provided by a call to DRM_IOCTL_QAIC_ATTACH_SLICE_BO. This