libc: minimal: Define time_t and suseconds_t

According to POSIX, these types should be defined by sys/types.h.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>

lib/libc/minimal/include/sys/types.h

@@ -40,4 +40,7 @@ typedef int off_t;
 
 #endif
 
+typedef long long time_t;
+typedef long suseconds_t;
+
 #endif /* ZEPHYR_LIB_LIBC_MINIMAL_INCLUDE_SYS_TYPES_H_ */