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docs: Fix note and add warning in i.MX8MM M4 guide

Merged Frieder Schrempf requested to merge feature/docs/improve-mx8mm-m4-docs into develop-dunfell
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@@ -155,10 +155,19 @@ for the application.
#### 3.1 Adding the Devicetree Nodes
!!! note" Step only needed for Example 2"
!!! note "Step only needed for Example 2"
This step is only needed for "Example 2". It can be skipped if only "Example
1" is used (loaded from U-Boot).
!!! warning "DDR addresses"
The example from NXP is configured for the NXP EVK with 2GB of DDR RAM. If
your hardware has less RAM available, you might have to adjust the memory
mapping of the M4 app and change the devicetree accordingly. For 1GB of DDR
using 0x77000000 as base for the M4 app and 0x78000000 for the shared
resources should work. In the M4 app `MEMORY` in
`MIMX8MM6xxxxx_cm4_ddr_ram.ld` and `VDEV0_VRING_BASE` in `board.h` needs to
be changed.
Add the following nodes to your board devicetree's root node in order to set up
the memory for the M4 core and the `remoteproc` driver.
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