hw/npu2.c: Use phys-map to get GPU memory BARs
hw/npu2.c: Use phys-map to get GPU memory BARs

The addresses should be the same as previous so there should be no functional
change.

Signed-off-by: Alistair Popple <e9adbcf81c8a36ccc628e09bc92d0e25e1c8e501@popple.id.au>
Reviewed-by: Andrew Donnellan <efc2d7c347a094a6ec1d918179e819039044c564@au1.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

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