feat(build) distinguish between K5 and K5C .fex files

lin

2025-04-17 61fc17be73a8a29ba860ed54a77e02c82a6866a2

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[package]
;item=Item_TOC_name,         Item_filename,
item=u-boot,                 u-boot.fex
item=soc-cfg,                config.fex
item=dtb,                    sunxi.fex