Add missing includes.

Exempt-From-Owner-Approval: trivial cleanup
Test: mma
Bug: None
Change-Id: Ieb452cc9ea6ffc600873562aa37a1e3fc031dd98
diff --git a/trusty/keymaster/trusty_keymaster_device.cpp b/trusty/keymaster/trusty_keymaster_device.cpp
index 55a03bd..b8c2032 100644
--- a/trusty/keymaster/trusty_keymaster_device.cpp
+++ b/trusty/keymaster/trusty_keymaster_device.cpp
@@ -17,6 +17,7 @@
 #define LOG_TAG "TrustyKeymaster"
 
 #include <assert.h>
+#include <errno.h>
 #include <openssl/evp.h>
 #include <openssl/x509.h>
 #include <stddef.h>