crypto: p10-aes-gcm - Remove POWER10_CPU dependency

Remove Power10 dependency in Kconfig and detect Power10 feature at runtime.

Signed-off-by: Danny Tsen <dtsen@linux.ibm.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>