overlay: Rename devicePath as busPath

It's the path to the sysfs directory representing an i2c bus, not a
device on that bus; let's name it to reflect that.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Change-Id: I1525f45cc2fd4a9690dc261fbe93ea734952057e
diff --git a/include/devices.hpp b/include/devices.hpp
index af89f16..4ac57ea 100644
--- a/include/devices.hpp
+++ b/include/devices.hpp
@@ -31,13 +31,13 @@
 
 struct ExportTemplate
 {
-    ExportTemplate(const char* params, const char* dev, const char* constructor,
+    ExportTemplate(const char* params, const char* bus, const char* constructor,
                    const char* destructor, bool createsHWMon) :
         parameters(params),
-        devicePath(dev), add(constructor), remove(destructor),
+        busPath(bus), add(constructor), remove(destructor),
         createsHWMon(createsHWMon){};
     const char* parameters;
-    const char* devicePath;
+    const char* busPath;
     const char* add;
     const char* remove;
     bool createsHWMon;