[RK3588] Fix UART baudrate to 115200
DDR binaries for RK3588 use default baudrate 1.5Mbps. With this patch, we fix baudrate to 115200. This fix has the consequence of fixing debug uart baudrate for loader and u-boot, and probably for the whole stack.
This is obtained by:
- modifying ddr_param.txt
- using command "./tools/ddrbin_tool ./tools/ddrbin_param.txt bin/rk35/rk3588_ddr_lp4_2112MHz_lp5_2736MHz_v1.10.bin"
At the moment we implement it here, but it would be much better to obtain this in the dedicated recipe in yocto.