linux-postmarketos-amlogic: upgrade to 6.7.2

This merge request upgrades the amlogic mainline kernel package to 6.7.2 and drops the librecomputer-solitude DT patches as they're now upstream.

Tested devices:

• amediatech-x96-mini (@exkc)
• beelink-gt1 (@exkc) [Cannot be tested]
• librecomputer-lafrite (@funderscore)
• librecomputer-lepotato (@funderscore)
• librecomputer-solitude (@Newbyte, @funderscore) [Try upgrading the SPI flash u-boot]
• videostrong-kii-pro (@funderscore)
• xiaomi-once (@exkc) [Cannot be tested]