hw/pci-host: Update PHB5 XSCOM registers

Add new XSCOM registers introduced in PHB5.
Apply bit-masks within xscom-write methods.
Bit-masks specified using PPC_BITMASK macro.

Signed-off-by: Saif Abrar <saif.abrar@linux.vnet.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Message-ID: <20231016175948.10869-1-saif.abrar@linux.vnet.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
4 files changed