Define PRIuSIZE for AOC

Bug: 163613105
Test: based on master branch
Change-Id: I2578145dbf8c5b1dd0401d4286dbd2e4787b99ad
diff --git a/chpp/platform/aoc/include/chpp/platform/log.h b/chpp/platform/aoc/include/chpp/platform/log.h
index 7f05a8f..7228fd8 100644
--- a/chpp/platform/aoc/include/chpp/platform/log.h
+++ b/chpp/platform/aoc/include/chpp/platform/log.h
@@ -23,6 +23,10 @@
 #include "FreeRTOS.h"
 #include "task.h"
 
+#ifndef PRIuSIZE
+#define PRIuSIZE "zu"
+#endif
+
 #define CHPP_AOC_LOG(level, fmt, ...)                                    \
   chreLog(level, "%s: " fmt, pcTaskGetName(xTaskGetCurrentTaskHandle()), \
           ##__VA_ARGS__)