[AMLUtils] Be rid of damned cpu type magic numbers / Recognize Meson8 platform (S802)
[AMLUtils] Ensure cputype range checks are valid.
[AMLUtils] Don't assume M1 for unknown CPUs
[AMLUtils] Apply MX cpu scale hack only to MX
[AMLUtils] Use M1 digital_raw val only on M1
[AMLUtils] Cosmetics

1) Sort device checks
2) Rename *cputype symbols to *device_type for consistency
[AMLUtils] Recognize Meson8 baby platform (S805)
[AMLUtils] Change some more permissions

In current Android 4.4.2 sources we need to change
permissions to 666 for following:

    /dev/amvideo
    /dev/amstream_sub
    /dev/amstream_sub_read
    /dev/amstream_rm
    /dev/amstream_mpps
    /dev/amstream_mpts
    /dev/amstream_abuf
    /dev/amstream_vbuf
[AMLUtils] Check for xbmc.no_need_su build.prop property before requesting SU
[AMLUtils] Change min/max freq and scaling governor node permissions only if Amlogic M6