Add missing cl_device_scheduling_controls_capabilities_img typedef to cl.xml (#1521)

Author: paulfradgley

xml/cl.xml

@@ -228,6 +228,7 @@ server's OpenCL/api-docs repository.
         <type category="define">typedef <type>cl_properties</type>    <name>cl_layer_properties</name>;</type>
         <type category="define">typedef <type>cl_uint</type>          <name>cl_icdl_info</name>;</type>
         <type category="define">typedef struct _cl_icd_dispatch       <name>cl_icd_dispatch</name>;</type>
+        <type category="define">typedef <type>cl_bitfield</type>      <name>cl_device_scheduling_controls_capabilities_img</name>;</type>
         <type category="define">typedef <type>cl_bitfield</type>      <name>cl_device_scheduling_controls_capabilities_arm</name>;</type>
         <type category="define">typedef <type>cl_bitfield</type>      <name>cl_device_controlled_termination_capabilities_arm</name>;</type>
         <type category="define">typedef <type>cl_bitfield</type>      <name>cl_command_queue_capabilities_intel</name>;</type>