powerpc: Add HWCAP2 aux entry
We are currently out of free bits in AT_HWCAP. With POWER8, we have several hardware features that we need to advertise. Tested on POWER and x86. Signed-off-by: NMichael Neuling <michael@neuling.org> Signed-off-by: NNishanth Aravamudan <nacc@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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