assert: check format arguments for correctness

This instructs the compiler to check that arguments to
__ASSERT/__ASSERT_NO_MSG are valid for printf.

Signed-off-by: Armin Brauns <armin.brauns@embedded-solutions.at>

include/zephyr/sys/__assert.h

@@ -26,7 +26,7 @@ extern "C" {
 #endif
 
 /* Wrapper around printk to avoid including printk.h in assert.h */
-void assert_print(const char *fmt, ...);
+void __printf_like(1, 2) assert_print(const char *fmt, ...);
 
 #ifdef __cplusplus
 }