add t113-s4 support 256M SiP DRAM, no ac remap.

[YuzukiTsuru]

• add t113-s4 support 256M SiP DRAM, with no ac remap.
• update t113-s3 auto_scan_dram_size func

[I] AWBoot r1 starting...
[D] DRAM BOOT DRIVE INFO: V0.24
[D] DRAM CLK = 792 MHz
[D] DRAM Type = 3 (2:DDR2,3:DDR3)
[D] DRAMC read ODT off
[D] ZQ value = 0x30
[D] DDR efuse: 0xa
[D] chip id efuse: 0x6800
[D] single rank and full DQ
[D] DDR efuse: 0xa
[D] chip id efuse: 0x6800
[D] rank 0 row = 14 
[D] para->dram_para1 = 0x10e2
[D] rank 0 bank = 8 
[D] para->dram_para1 = 0x10e2
[D] rank 0 page size = 2 KB 
[D] para->dram_para1 = 0x10e2
[D] DRAM ODT value: 0x42
[D] DDR efuse: 0xa
[D] chip id efuse: 0x6800
[D] DRAM: size = 256MB
[D] DRAM: simple test OK