KVM: Reformat KVM_SET_ONE_REG register documentation

KVM: Reformat KVM_SET_ONE_REG register documentation

Some of the MIPS registers that can be accessed with the
KVM_{GET,SET}_ONE_REG interface have fairly long names, so widen the
Register column of the table in the KVM_SET_ONE_REG documentation to
allow them to fit.

Tabs in the table are replaced with spaces at the same time for
consistency.

Signed-off-by: James Hogan <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Gleb Natapov <[email protected]>
Cc: [email protected]
Cc: Randy Dunlap <[email protected]>
Cc: [email protected]
Signed-off-by: Paolo Bonzini <[email protected]>