mt48lc16m16a2: import Micron's original file

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>
mt48lc16m16a2: add misc patches

This patch adds a series of patch for:
- update the module declaration (add some parameters),
- add an option for clearing the SDRAM before it is used,
- add tasks to get/set bytes/sorts in the whole memory,
- turn off the debug messages.

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>