kernel: add stub logging function

include/socks/printk.h

@@ -0,0 +1,6 @@
+#ifndef SOCKS_PRINTK_H_
+#define SOCKS_PRINTK_H_
+
+extern int printk(const char *format, ...);
+
+#endif

kernel/printk.c

@@ -0,0 +1,9 @@
+
+#define LOG_BUFFER_SIZE 0x40000
+
+static char log_buffer[LOG_BUFFER_SIZE] = {0};
+
+int printk(const char *format, ...)
+{
+	return 0;
+}