arm64: kernel: Fix kernel warning when nokaslr is passed to commandline

arm64: kernel: Fix kernel warning when nokaslr is passed to commandline

'Unknown kernel command line parameters "nokaslr", will be passed to
user space' message is noticed in the dmesg when nokaslr is passed to
the kernel commandline on ARM64 platform. This is because nokaslr param
is handled by early cpufeature detection infrastructure and the parameter
is never consumed by a kernel param handler. Fix this warning by
providing a dummy kernel param handler for nokaslr.

Signed-off-by: Pavankumar Kondeti <quic_pkondeti@quicinc.com>
Link: https://lore.kernel.org/r/20230412043258.397455-1-quic_pkondeti@quicinc.com
Signed-off-by: Will Deacon <will@kernel.org>