drivers/serial: Use lldbg in uart_register

[seokhun-eom24]

To prevent idle task errno from being set to EBADF during boot, replace dbg() with lldbg() in uart_register().
Because during uart_register stdout is not ready, so we have to use lldbg.

Registering log are printed like below.

up_initialize: [Reboot Reason] : 55
uart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
uart_register: Registering /dev/ttyS1
uart_register: Registering /dev/ttyS2
Logtask init ok!

[pcs1265]

LGTM

[ewoodev]

is it mandatory logs during boot? if it's no, please use vlldbg.

The dbg is using stdout stream which is used /dev/console. the console register is needed replacing to lldbg
And, the UART Register is called before group_setupidlefiles which is getting fd of /dev/console`, so other registering also is needed lldbg.
It's correct changs. 👍👍👍

[seokhun-eom24]

is it mandatory logs during boot? if it's no, please use vlldbg.

The dbg is using stdout stream which is used /dev/console. the console register is needed replacing to lldbg And, the UART Register is called before group_setupidlefiles which is getting fd of /dev/console`, so other registering also is needed lldbg. It's correct changs. 👍👍👍

Right. Success log is not mandatory during boot.
I seperate log for success and fail case to use llvdbg and lldbg for each case.