board: nuvuton: arbel: Fix incorrect ram size

1. Fix incorrect ram size of 4GB dram with ECC enabled
2. Fix wrong place to set dram bank size
   - The dram bank size should be set in dram_init_banksize
   - Dram_init should not access gd->bd because the board info
     struct is not reserved yet.

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