[PATCH v4 09/15] NTB: switchtec_ntb: Initialize hardware for doorbells and messages

Set up some hardware registers and creates interrupt service routines for the doorbells and messages. There are 64 doorbells in the switch that are shared between all partitions. The upper 4 doorbells are also shared with the messages and are therefore not used. Thus, this provides 28 doorbells

[PATCH v4 09/15] NTB: switchtec_ntb: Initialize hardware for doorbells and messages

Set up some hardware registers and creates interrupt service routines for the doorbells and messages. There are 64 doorbells in the switch that are shared between all partitions. The upper 4 doorbells are also shared with the messages and are therefore not used. Thus, this provides 28 doorbells