kernel/reboot.c: re-enable the function of variable reboot_default
kernel/reboot.c: re-enable the function of variable reboot_default

Commit 1b3a5d02ee07 ("reboot: move arch/x86 reboot= handling to generic
kernel") did some cleanup for reboot= command line, but it made the
reboot_default inoperative.

The default value of variable reboot_default should be 1, and if command
line reboot= is not set, system will use the default reboot mode.

[5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org: fix comment layout]
Signed-off-by: Li Fei <edd2a38ef426c40de627f24626483c8068eaf91c@intel.com>
Signed-off-by: liu chuansheng <858732b0d97598091e89a0d1be1593caf0442efe@intel.com>
Acked-by: Robin Holt <6781f0d01b1602361cb947fdc9aff99e971f4de4@linux.com>
Cc: <4fbacc2fa0ffdbb11bf1ad6925b886ebd08dd15f@vger.kernel.org>	[3.11.x]
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs