genericirq.tmpl: convert it to ReST

Brainless conversion of genericirq.tmpl book to ReST, via
	Documentation/sphinx/tmplcvt

Copyright information inserted manually.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/DocBook/Makefile

@@ -11,7 +11,7 @@ DOCBOOKS := z8530book.xml  \
 	    writing_usb_driver.xml networking.xml \
 	    kernel-api.xml filesystems.xml lsm.xml kgdb.xml \
 	    gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \
-	    genericirq.xml s390-drivers.xml scsi.xml \
+	    s390-drivers.xml scsi.xml \
 	    sh.xml w1.xml \
 	    writing_musb_glue_layer.xml
 

Documentation/core-api/index.rst

@@ -16,6 +16,7 @@ Core utilities
    cpu_hotplug
    local_ops
    workqueue
+   genericirq
    flexible-arrays
 
 Interfaces for kernel debugging