KVM: s390: get rid of register asm usage

Using register asm statements has been proven to be very error prone,
especially when using code instrumentation where gcc may add function
calls, which clobbers register contents in an unexpected way.

Therefore get rid of register asm statements in kvm code, even though
there is currently nothing wrong with them. This way we know for sure
that this bug class won't be introduced here.

Signed-off-by: Heiko Carstens <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Reviewed-by: Thomas Huth <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Reviewed-by: Claudio Imbrenda <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[[email protected]: checkpatch strict fix]
Signed-off-by: Christian Borntraeger <[email protected]>

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