v8.4_RC2 AGNi for MIATOLL excalibur/curtana/joyeuse/gram

Merge kernel 4.14.224
Merge CAF LA.UM.9.1.r1-09100-SMxxx0.0 (AOSP & MIUI R)
qcacld-3.0: Merge wifi CAF LA.UM.9.1.r1-09100-SMxxx0.0 (AOSP & MIUI R)
AGNi sound mod v2.4 with HiFi audio mode.
ion: Implement ion heap pool auto refill + more updates
Revert few commits