Add a SysRq option to lift kernel lockdown

Add a SysRq option to lift kernel lockdown

Make an option to provide a sysrq key that will lift the kernel lockdown,
thereby allowing the running kernel image to be accessed and modified.

On x86 this is triggered with SysRq+x, but this key may not be available on
all arches, so it is set by setting LOCKDOWN_LIFT_KEY in asm/setup.h.
Since this macro must be defined in an arch to be able to use this facility
for that arch, the Kconfig option is restricted to arches that support it.

Signed-off-by: Kyle McMartin <kyle@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: x86@kernel.org
[bwh: Forward-ported to upstream lockdown:
 - Change config dependency to SECURITY_LOCKDOWN_LSM
 - Compare kernel_locked_down with LOCKDOWN_NONE instead of treating it
   as a bool
 - Adjust filenames, context]

Gbp-Pq: Topic features/all/lockdown
Gbp-Pq: Name add-a-sysrq-option-to-lift-kernel-lockdown.patch