v0.3 release for FIT-based multi DTB support

What's Changed

• Update board-id for Purwa by yijiyang in #54
• Separate out soc version and board revision as suffixes by Amrit Anand (@amrianan) in #57
• Update qcom-next-fitimage.its by Kaushal Kumar (@quic-kaushalk) in #58
• Update qcom-next-fitimage.its by Kaushal Kumar (@quic-kaushalk) in #59

New Contributors

• yijiyang made their first contribution in #54

Full Changelog: v0.2...v0.3