Documentation: Add debugfs doc for hisi_zip

Add debugfs descriptions for HiSilicon ZIP and QM driver.
Signed-off-by: NZhou Wang <wangzhou1@hisilicon.com>
Reviewed-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Documentation/ABI/testing/debugfs-hisi-zip

+What:           /sys/kernel/debug/hisi_zip/<bdf>/comp_core[01]/regs
+Date:           Nov 2018
+Contact:        linux-crypto@vger.kernel.org
+Description:    Dump of compression cores related debug registers.
+		Only available for PF.
+
+What:           /sys/kernel/debug/hisi_zip/<bdf>/decomp_core[0-5]/regs
+Date:           Nov 2018
+Contact:        linux-crypto@vger.kernel.org
+Description:    Dump of decompression cores related debug registers.
+		Only available for PF.
+
+What:           /sys/kernel/debug/hisi_zip/<bdf>/clear_enable
+Date:           Nov 2018
+Contact:        linux-crypto@vger.kernel.org
+Description:    Compression/decompression core debug registers read clear
+		control. 1 means enable register read clear, otherwise 0.
+		Writing to this file has no functional effect, only enable or
+		disable counters clear after reading of these registers.
+		Only available for PF.
+
+What:           /sys/kernel/debug/hisi_zip/<bdf>/current_qm
+Date:           Nov 2018
+Contact:        linux-crypto@vger.kernel.org
+Description:    One ZIP controller has one PF and multiple VFs, each function
+		has a QM. Select the QM which below qm refers to.
+		Only available for PF.
+
+What:           /sys/kernel/debug/hisi_zip/<bdf>/qm/qm_regs
+Date:           Nov 2018
+Contact:        linux-crypto@vger.kernel.org
+Description:    Dump of QM related debug registers.
+		Available for PF and VF in host. VF in guest currently only
+		has one debug register.
+
+What:           /sys/kernel/debug/hisi_zip/<bdf>/qm/current_q
+Date:           Nov 2018
+Contact:        linux-crypto@vger.kernel.org
+Description:    One QM may contain multiple queues. Select specific queue to
+		show its debug registers in above qm_regs.
+		Only available for PF.
+
+What:           /sys/kernel/debug/hisi_zip/<bdf>/qm/clear_enable
+Date:           Nov 2018
+Contact:        linux-crypto@vger.kernel.org
+Description:    QM debug registers(qm_regs) read clear control. 1 means enable
+		register read clear, otherwise 0.
+		Writing to this file has no functional effect, only enable or
+		disable counters clear after reading of these registers.
+		Only available for PF.