linux-postmarketos-qcom-sdm660: upgrade to 6.7.0

New kernel release for Qualcomm sdm630/636/660 devices.

Xiaomi Mi Pad 4 device package got variation for Mi Pad 4 PLUS. Differences between clover and clover-plus justify having separate device tree in kernel:

• different touchscreen (FTS vs Goodix)
• different panel (same resolution, but 8 inch mdss_dsi_nt51021_boe_wuxga_video NT51021_BOE_BOE vs 10 inch mdss_dsi_nt51021_boe_10wu_wuxga_video NT51021_BOE_BOE10)
• some deviceinfohw stats for regular clover report SoC as SDA660, not SDM660 (so, without LTE). gsmarena confirms there are variations without LTE

New devices:

• Xiaomi Mi Pad 4 Plus (by @kubntd, @minlexx)
  • simpledrm framebuffer
  • touchscreen
  • backlight
  • battery (fuelgauge, charger)
  • radios (modem, Wi-Fi, Bluetooth)

Changes to existing devices:

• xiaomi-lavender (by @minlexx):
  • radios (modem, Wi-Fi, Bluetooth)
  • battery (fuelgauge, charger)
• xiaomi-tulip (by @M0Rf30):
  • touchscreen
  • fixed vol-down button
  • Bluetooth

Fixes: #1580 (closed), #2501 (closed)

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P.S. to actually use radio interfaces on devices, nonfree firmware needs to be packaged (will be done in separate MRs). While I'm working on adjusting msm-firmware-loader, tqftpserv and pd-mapper to cooperate together, this MR can be merged. Devices will work fine, just without modem/WiFi for now and it is already an improvement and several bug fixes. Or we can wait even longer for unknown amount of time..