Sync helios64 to its updated 6.9 dts

[prahal]

Description

Per Igor comment helios64 required work to sync with upstream changes.
I took the liberty to keep more of upstream than in Armbian 6.8, namely:

• I kept nodes at their upstream location to remove unnecessary work when syncing to the upstream
• keep "ethernet0 = &gmac;" in aliases, to let the ethernet MAC retrieved from OTP in u-boot apply. This will restore this feature (the u-boot was still functional). U-boot retried ethernet MACs are in u-boot printenv output "ethaddr" and "eth1addr". Seems for a few years I had the Linux kernel autogenerated one but my config still had the correct one commented (I did not find why it broke back then).
• I removed the overclock disabling code as the overclock is not included in the dts so no need to disable it (will lower the sync to upstream burden)
• kept upstream fix 93b36e1d3748c352a70c69aa378715e6572e51d1 "arm64: dts: rockchip: Fix USB interface compatible string on kobol-helios64"
• from upstream in vcc3v0_sd node I kept "enable-active-high;" and "gpio = <&gpio0 RK_PA1 GPIO_ACTIVE_HIGH>;"
• sync to upstream from helios64::status to helios64:green:status for system_leds : status_led
• kept startup-delay-us = <2000000> on hdd nodes from upstream (I believe they should not be the same value for rail a and b of the HDD, one should do as in the helios64 u-boot code where one is started after the other to lower the current load)
• I also did not sync with upstream the differences of gpio pull config for "power > sdmmc0_pwr_h" and "pinctrl > pmic > pmic_int_l"
• I kept the upstream DTS model "Kobol Helios64" instead of the armbian "Helios64". Ethernet rename from armbian-hardware-optimization works.

Documentation summary for feature / change

• short restore ethernet MACs for eth0 read from OTP via u-boot
• This will restore the original intent which is to have the eth0 mAC be defined from the mainboard. This might affect MAC-based DHCP definitions
• ip l to get the Linux-defined eth0/end0 MAC, printenv in u-boot to see ethaddr and eth1addr for eth0/end0 and eth1

How Has This Been Tested?

• Compile, installed, and reboot, checked assigned IP was from the dnsmasq dhcp-host definition for this ethernet MAC. Did a few other reboots.

Checklist:

• [ x ] My code follows the style guidelines of this project
• [ x ] I have performed a self-review of my own code
• [ x ] My changes generate no new warnings

[igorpecovnik]

Great job! Thank you.