HSI: Remove struct hsi_client private fields from kernel-doc

The kernel-doc how to says that structure fields that are inside a
"private:" area shouldn't be listed in the generated documentation
but the private fields for struct hsi_client private are listed.

This also fixes the following make htmldocs warnings:

.//include/linux/hsi/hsi.h:150: warning: Excess struct/union/enum/typedef member 'e_handler' description in 'hsi_client'
.//include/linux/hsi/hsi.h:150: warning: Excess struct/union/enum/typedef member 'pclaimed' description in 'hsi_client'
.//include/linux/hsi/hsi.h:150: warning: Excess struct/union/enum/typedef member 'nb' description in 'hsi_client'

Signed-off-by: Javier Martinez Canillas <[e-mail]>
Signed-off-by: Sebastian Reichel <[e-mail]>

include/linux/hsi/hsi.h

···
  * @device: Driver model representation of the device
  * @tx_cfg: HSI TX configuration
  * @rx_cfg: HSI RX configuration
- * @e_handler: Callback for handling port events (RX Wake High/Low)
- * @pclaimed: Keeps tracks if the clients claimed its associated HSI port
- * @nb: Notifier block for port events
  */
 struct hsi_client {
 	struct device		device;