Summary

Several small changes relating to the recently-added Tandy machines and Cirrus video:

• Cirrus CL-GD5402/Acumos AVGA2 video now has configurable VRAM with both 256KB and 512KB options
• Changed Cirrus CL-GD5428 ISA onboard device to only support 512KB and 1MB VRAM configs matching the real VRAM options for the machines using it
• Moved the Intel Monsoon over to using the Dell (512KB/1MB VRAM) CL-GD5428 VLB variant and rename it to reflect the fact it is no longer specific to a Dell machine.
• Fixed a warning in the Sensation 1 audio code
• Removed the incorrect MACHINE_APM flag from the Sensation machines (VL82C486 does not support SMI#)
• Renamed the Tandy Sensation II to remove the references to the 3100 and MMPC since there are some board differences from the Sensation II (such as using a CL-GD5426 for onboard video) and the BIOS is different.
• Added a Cirrus CL-GD5428 variant with a fixed 1MB VRAM config and made the Sensation II use it

Checklist

• Closes #xxx
• I have tested my changes locally and validated that the functionality works as intended
• I have discussed this with core contributors already
• This pull request requires changes to the ROM set
  • I have opened a roms pull request - https://github.com/86Box/roms/pull/changeme/
• This pull request requires changes to the asset set
  • I have opened an assets pull request - https://github.com/86Box/assets/pull/changeme/

References

Provide links to datasheets or other documentation that helped you implement this pull request.

• Cirrus registers in VGADOC: https://raw.githubusercontent.com/whatisaphone/tower-pc/refs/heads/master/docs/video/vgadoc4b/CIRRUS.TXT
• Cirrus CL-GD5402/AVGA2 reference manual: http://www.vgamuseum.info/index.php/companies/item/download/195_3e8fe6fd2938351c887e4f32ddc6fd41
• CLASSICR.HLP from https://www.elhvb.com/mboards/intel/files/help/Index.html