A following warning message can be found in dmesg during boot:
fsl_lpspi 44370000.spi: dma setup error -19, use pio
There are two causes of it:
The current MR addresses the problem with device tree. And adjustment of Kernel config is done in another MR: sw/ked/meta-ked-bsp!97 (closed)
Note: while these changes help to get rid of this warning, they may not be really needed at the end. Because the EERAM device, which is on lpspi2, is still not able to start.