of: add 'of_' prefix to machine_is_compatible()

machine is compatible is an OF-specific call.  It should have
the of_ prefix to protect the global namespace.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Michal Simek <monstr@monstr.eu>
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 785e9cc..6bc8740 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -219,13 +219,13 @@
 EXPORT_SYMBOL(of_device_is_compatible);
 
 /**
- * machine_is_compatible - Test root of device tree for a given compatible value
+ * of_machine_is_compatible - Test root of device tree for a given compatible value
  * @compat: compatible string to look for in root node's compatible property.
  *
  * Returns true if the root node has the given value in its
  * compatible property.
  */
-int machine_is_compatible(const char *compat)
+int of_machine_is_compatible(const char *compat)
 {
 	struct device_node *root;
 	int rc = 0;
@@ -237,7 +237,7 @@
 	}
 	return rc;
 }
-EXPORT_SYMBOL(machine_is_compatible);
+EXPORT_SYMBOL(of_machine_is_compatible);
 
 /**
  *  of_device_is_available - check if a device is available for use