Retore LP64 fix that was removed by mistake
add support imx6 Secure Non-Volatile Storage (SNVS) real-time clock
* resolve arm root clock from CCM to attach a9tmr
* don't match/attach imx6_ahcisata on iMX6 Solo/SoloLite/DualLite
* add imxsnvs (rtc)
* add CUBOX-I config