Revert "optimized LPDDR RAM timings (~10% throughput increase)"

This reverts commit d2e7546f7e992f88b01f3c28ed3e2668fdfbd0b1.
Revert "OMAP4430/60: EMIF: errata i743: Prohibit usage of Power-Down mode"

This reverts commit fe76188e3856f793a3a0fe64e992704ec705d1b4.
omap2: lpddr2 ram overclock

Signed-off-by: Willi Ye <williye97@gmail.com>