powerpc: Use TIDR CPU feature to control TIDR allocation
Switch the use of TIDR on it's CPU feature, rather than assuming it is available based on architecture. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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