configs: npcm: Support more uart baud rate

Add uart baud rate table to arbel(npcm8xx) and poleg(npcm7xx)

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
[trini: Rework slightly]
Signed-off-by: Tom Rini <trini@konsulko.com>
2 files changed