Add kernel logging task

- Enable creating kernel tasks
- Create kernel task that disables immediate-mode logging and prints
  logs to the console forever

src/kernel/cpu.cpp

@@ -3,6 +3,8 @@
 #include "cpu.h"
 #include "log.h"
 
+cpu_data bsp_cpu_data;
+
 inline static void
 __cpuid(
 	uint32_t leaf,