This reverts commit 059323fb6a8f21637bb617919715c2427f24777c. This commit 059323fb6a8f21637bb617919715c2427f24777c use JESD79-3E which is not the newest spec. Should use JESD79-3F in which tRFC is 260ns for 4Gb chip. Signed-off-by: Peng Fan <Peng.Fan@freescale.com> Cc: Stefano Babic <sbabic@denx.de> Cc: Tim Harvey <tharvey@gateworks.com>