arm64: Defer enabling pointer authentication on boot core

mainline inclusion
from mainline-v5.12-rc1
commit 7f624085
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I7QNYP

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=7f6240858cf3abb75237c9ba63ec70d232573ae8



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Defer enabling pointer authentication on boot core until
after its required to be enabled by cpufeature framework.
This will help in controlling the feature dynamically
with a boot parameter.

Signed-off-by: Ajay Patil <pajay@qti.qualcomm.com>
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1610152163-16554-2-git-send-email-sramana@codeaurora.org


Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Link: https://lore.kernel.org/r/20210208095732.3267263-22-maz@kernel.org


Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: GONG, Ruiqi <gongruiqi1@huawei.com>