linux-qoriq: update to LSDK 20.12 release (5.4.47)
Upgrade to LSDK-20.12 release with below key updates:
* Support of LX2162A QDS
* ACPI mode on LX2160A and LS1046A
* DPAA2: adding bulking to XDP, building Tx S/G frames instead of realloc-ing skb, update bridge link status
* ENETC: adaptive interrupt coalescing
* Felix switch: configurable MTU for (jumbo frame support), port and flow policers (DSA)
* IEEE1588: one-step timestamping on DPAA2, pps and periodical clock signal on Felix switch, FIPER3 on DPAA2, external trigger
* PCIe: power management support
* PPFE: driver be built-in instead of module
* SDHC: eMMC RPBM partition, HS200 on LS1088A
