nx: remove check on the "qemu, powernv" property
nx: remove check on the "qemu, powernv" property

commit 95f7b3b9698b ("nx: Don't abort on missing NX when using a QEMU
machine") introduced a check on the property "qemu,powernv" to skip NX
initialization when running under a QEMU machine.

The QEMU platforms now expose a QUIRK_NO_RNG in the chip. Testing the
"qemu,powernv" property is not necessary anymore.

Signed-off-by: Cédric Le Goater <2d8cace2254d4e43578d21933db015d84bcc468a@kaod.org>
Reviewed-by: Joel Stanley <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@jms.id.au>
Reviewed-by: Andrew Jeffery <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@aj.id.au>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.ibm.com>

stewart-ibm/skiboot,qemu/skiboot,legoater/skiboot,open-power/skiboot,legoater/skiboot,open-power/skiboot,legoater/skiboot,shenki/skiboot,legoater/skiboot,open-power/skiboot,legoater/skiboot,shenki/skiboot,qemu/skiboot,open-power/skiboot,shenki/skiboot,shenki/skiboot,stewart-ibm/skiboot,open-power/skiboot,stewart-ibm/skiboot,qemu/skiboot,shenki/skiboot,qemu/skiboot,qemu/skiboot