chipmisc: Add support for Replicape board

Add support for configuring and controlling the hardware specific to
the revision "B3" Replicape board.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

docs/beaglebone.md

@@ -71,6 +71,20 @@ make flash
 sudo service klipper start
 ```
 
+For the Replicape, it is also necessary to compile and install the
+micro-controller code for a Linux host process. Run "make menuconfig"
+a second time and configure it for a "Linux process":
+```
+make menuconfig
+```
+
+Then install this micro-controller code as well:
+```
+sudo service klipper stop
+make flash
+sudo service klipper start
+```
+
 Remaining configuration
 =======================