linux-postmarketos-qcom-sm8250: upgrade to 6.4.0 rc2

Changes in kernel:

• upgrade to 6.4.0 rc2
• enable zram
• enable SCSI_UFS_BSG needed for qbootctl

Changes in firmware-xiaomi-elish:

• add cirrus cs35l41 firmware
• add boe variant touchscreen firmware

Changes in device-xiaomi-elish:

• enable speaker amplifier

Changes in alsa-ucm-conf-qcom-sm8250:

• new aport

Tested:

• Xiaomi Mi Pad 5 Pro (CSOT)
• OnePlus 8 Pro

CC @pangwalla