mtd: atmel_nand: don't map the ROM table if no pmecc table offset in DT
mtd: atmel_nand: don't map the ROM table if no pmecc table offset in DT

if atmel,pmecc-lookup-table-offset is not found in DT node, we don't
need to map the ROM table as we will build a runtime gf table anyway.

Reported-by: Nicolas Ferre <45b517be0e5ec6dc3a39715767c1d18e090d39b4@atmel.com>
Signed-off-by: Josh Wu <5d315a13f7549d1ecf8e62305448b567ef831df9@atmel.com>
Acked-by: Nicolas Ferre <45b517be0e5ec6dc3a39715767c1d18e090d39b4@atmel.com>
Signed-off-by: Brian Norris <ac73eed4b8a8c9127255a2696c52b2e7503720b8@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs