arm, davinci: da850/dm365 lowlevel cleanup

arm, davinci: da850/dm365 lowlevel cleanup

- Cleanup a lot of fix values, and use defines instead.
- Also make some values configurable through the board config
  file.
- delete the NAND_SPL code for da850, as it is not used actually
- remove the asm code

Signed-off-by: Heiko Schocher <[email protected]>
Cc: Wolfgang Denk <[email protected]>
Cc: Sandeep Paulraj <[email protected]>
Cc: Albert ARIBAUD <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Christian Riesch <[email protected]>
Signed-off-by: Sandeep Paulraj <[email protected]>