stm class: dummy_stm: Add dummy driver for testing stm class

This is a simple module that pretends to be an stm device and discards
all the data that comes in. Useful for testing stm class and its users.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hwtracing/stm/Makefile b/drivers/hwtracing/stm/Makefile
index adec701..1b2725f 100644
--- a/drivers/hwtracing/stm/Makefile
+++ b/drivers/hwtracing/stm/Makefile
@@ -1,3 +1,5 @@
 obj-$(CONFIG_STM)	+= stm_core.o
 
 stm_core-y		:= core.o policy.o
+
+obj-$(CONFIG_STM_DUMMY)	+= dummy_stm.o