TQMa8MxNL - YOCTO Linux BSP documentation

U-Boot:
- mfgtool config fails to write image to eMMC / SD with error -19 (No such device). The USB gadget is not enabled in U-Boot specific device tree part. To make it work, the following changes need to be added to arch/arm/dt/imx8mn-mba8mx-u-boot.dtsi:
```
&usbg1 {
  status = "okay";
};
```
- USB mass storage support may vary among different USB flash drive models/vendors
Linux: operating points for DDR controller missing in device tree. running at lower DDR frequencies does not work in this version of BSP.
LVDS shows wrong colors on older Tianma display kit (HW issue on older display kit revisions)
Mikrobus Modul RTC5 on ecspi1 don't answer
Audio does not work after suspend / resume (clocking problem)
MIPI CSI
- driver stack is not completely v4l2-compliance test proof. The IOCTLS for format / resolution enumeration and query can return invalid / wrong values depending of the internal state of the driver stack. Please follow given examples for a working setup.
- IMX327: bayer support with 12 Bit does not work at the moment, only 10 Bit with 1280x720 is tested with gstreamer
- IMX327: when configuring to SRGGB12 reboot may be needed to get a working capture again
- OV9281: gstreamer: capture not starting out of the box, need to use yavta to capture some frames, gstreamer starts afterwards