Revert "OMAP4: EMIF: Added timings for 466MHz elpida lpddr2 memory"

This reverts commit c1edbf66896df1c0276cf33e73043e8b8ebbc807.
Revert "OMAP4: clock: Extend L3 clock dependencies to cover 4470"

This reverts commit d95232980dcbfb941f84785cb7ed9b11f62c2041.