[HAL] Add Xbox Hardware Abstraction Layer

- Create xbox.cmake based on legacy.cmake and pic.cmake
- Revive Xbox HAL files and add them to the build
- Fix boot with Xbox HAL, add missing parts from halinit_up.c
- Code style and debug logging improvements in pcibus.c
- Allow to choose Xbox HAL in usetup

CORE-16216

boot/bootdata/txtsetup.sif

@@ -224,6 +224,7 @@ pci_up = "Standard PC Uniprocessor"
 ;pci_mp = "Standard PC Multiprocessor"
 acpi_up = "ACPI PC Uniprocessor"
 ;acpi_mp = "ACPI PC Multiprocessor"
+xbox = "Original Xbox"
 
 [Map.Computer]
 ;<id> = <pnp id string>
@@ -231,6 +232,7 @@ pci_up = "PC UP"
 ;pci_mp = "PC MP"
 acpi_up = "ACPI UP"
 ;acpi_mp = "ACPI MP"
+xbox = "Xbox"
 
 [Files.pci_up]
 ntoskrnl.exe = 1,,,,,,,2,,,,1,2
@@ -248,6 +250,10 @@ halacpi.dll  = 1,,,,,,,2,,,hal.dll,1,2
 ;ntkrnlmp.exe = 1,,,,,,,2,,,ntoskrnl.exe,1,2
 ;halacpi.dll  = 1,,,,,,,2,,,hal.dll,1,2
 
+[Files.xbox]
+ntoskrnl.exe = 1,,,,,,,2,,,,1,2
+halxbox.dll  = 1,,,,,,,2,,,hal.dll,1,2
+
 [Display]
 ;<id> = <user friendly name>,<spare>,<service key name>,<height>,<width>,<bpp>
 vga              = "VGA Display (640x480x4)",,Vga,640,480,4