simba: rename PBMPCIBridge and QOM types to reflect simba naming

simba: rename PBMPCIBridge and QOM types to reflect simba naming

Here we rename PBMPCIBridge to SimbaPCIBridge and the QOM type from
TYPE_PBM_PCI_BRIDGE to TYPE_SIMBA_PCI_BRIDGE in improve the clarity
of the device name.

Also touch up the relevant spots in apb.c and various other function
names as appropriate.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Acked-by: Artyom Tarasenko <atar4qemu@gmail.com>