sysctl: rename kern_table -> sysctl_subsys_table

Renamed sysctl table from kern_table to sysctl_subsys_table and grouped
the two arch specific ctls to the end of the array.

This is part of a greater effort to move ctl tables into their
respective subsystems which will reduce the merge conflicts in
kernel/sysctl.c.

Signed-off-by: Joel Granados <joel.granados@kernel.org>

kernel/sys.c

@@ -210,7 +210,6 @@ static int __init init_overflow_sysctl(void)
 
 postcore_initcall(init_overflow_sysctl);
 
-
 /*
  * Returns true if current's euid is same as p's uid or euid,
  * or has CAP_SYS_NICE to p's user_ns.