arm64: kvm: Fix copy-and-paste error in bhb templates for v5.10 stable

KVM's infrastructure for spectre mitigations in the vectors in v5.10 and
earlier is different, it uses templates which are used to build a set of
vectors at runtime.

There are two copy-and-paste errors in the templates: __spectre_bhb_loop_k24
should loop 24 times and __spectre_bhb_loop_k32 32.

Fix these.

Reported-by: Pavel Machek <pavel@denx.de>
Link: https://lore.kernel.org/all/20220310234858.GB16308@amd/


Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>