Use CAP_MASK_LONG for file capabilities.

Extract the |1ULL << $CAP_NAME| construct to a macro, to avoid
repeating it.

Change-Id: I9312c27130d7e6c5b6ab3b4cc5c70a6b98378b98
diff --git a/include/private/android_filesystem_config.h b/include/private/android_filesystem_config.h
index 7047e0f..3e8d62a 100644
--- a/include/private/android_filesystem_config.h
+++ b/include/private/android_filesystem_config.h
@@ -32,6 +32,8 @@
 #include "android_filesystem_capability.h"
 #endif
 
+#define CAP_MASK_LONG(cap_name)  (1ULL << (cap_name))
+
 /* This is the master Users and Groups config for the platform.
  * DO NOT EVER RENUMBER
  */