powerpc: Remove now superfluous sentinel element from ctl_table arrays

This commit comes at the tail end of a greater effort to remove the
empty elements at the end of the ctl_table arrays (sentinels) which
will reduce the overall build time size of the kernel and run time
memory bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/[e-mail]/)

Remove sentinel from powersave_nap_ctl_table and nmi_wd_lpm_factor_ctl_table.
This removal is safe because register_sysctl implicitly uses ARRAY_SIZE()
in addition to checking for the sentinel.

Signed-off-by: Joel Granados <[e-mail]>
Signed-off-by: Luis Chamberlain <[e-mail]>

arch/powerpc/kernel/idle.c

···
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
-	{}
 };
 
 static int __init

arch/powerpc/platforms/pseries/mobility.c

···
 		.mode		= 0644,
 		.proc_handler	= proc_douintvec_minmax,
 	},
-	{}
 };
 
 static int __init register_nmi_wd_lpm_factor_sysctl(void)