rk3126c: slc: add code

build from:
759c70: src: nand: Fix nand compiler error
update feature:
Add rk3126c slc nand support, slc for ftl case, wo_ftl for mtd case.

Change-Id: I96b132a5beafa305506f

rk3126c: slc: add code

build from:
759c70: src: nand: Fix nand compiler error
update feature:
Add rk3126c slc nand support, slc for ftl case, wo_ftl for mtd case.

Change-Id: I96b132a5beafa305506f1aadb45c9f165b09ca84
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

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