commpage: randomize position of commpage

This patch introduces randomization of commpage position. From now on commpage
table contains offsets from begining to of the commpage to the particular
commpage entry. Similary addresses of symbols in ELF memory image "commpage"
are just offsets from the begining of the commpage.

This patch also updates KDL so that commpage entries are recognized and shown
correctly in stack trace. An update of Debugger is yet to be done.

headers/private/libroot/libroot_private.h

@@ -34,7 +34,7 @@ void __init_env(const struct user_space_program_args *args);
 void __init_heap(void);
 void __init_heap_post_env(void);
 
-void __init_time(void);
+void __init_time(addr_t commPageTable);
 void __arch_init_time(struct real_time_data *data, bool setDefaults);
 bigtime_t __arch_get_system_time_offset(struct real_time_data *data);
 bigtime_t __get_system_time_offset();