[U-Boot] Issue faced due to "serial: Remove DM_FLAG_PRE_RELOC flag in various drivers" patch

[Priyanka Jain]

Hello,

I am working to add support for NXP LX2160ARDB board support" "https://patchwork.ozlabs.org/patch/1004541/"

For serial driver, we are using PL01X_SERIAL driver with DM_SERIAL enabled
Since we need to support various clock frequencies, we have defined pl01x_serial_platdata in board file 
So it's a combination of CONFIG_DM_SERIAL + pl01x_serial_platdata

Also we have requirement to use serial driver before relocation as well.

Now with the patch  " serial: Remove DM_FLAG_PRE_RELOC flag in various drivers" 
the flag "DM_FLAG_PRE_RELOC" is no longer getting set resulting in UART driver not being available before relocation.

I tried adding "u-boot,dm-pre-reloc" in uart node, but it doesn't helped. [May be because uart nodes are set to disable to use 'pl01x_serial_platdata' method]

Can you please provide some suggestions on this issue.
How to use "DM_SERIAL + pl01x_serial_platdata" feature in pre_reloc phase?

Regards
Priyanka