arm64: cpufeatures: Allow disabling of BTI from the command-line

In order to be able to disable BTI at runtime, whether it is
for testing purposes, or to work around HW issues, let's add
support for overriding the ID_AA64PFR1_EL1.BTI field.

This is further mapped on the arm64.nobti command-line alias.

Signed-off-by: Marc Zyngier <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
Acked-by: David Brazdil <[email protected]>
Tested-by: Srinivas Ramana <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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