Tegra: drivers: memctrl: move chip specific defines to tegra_def.h

This patch moves the chip specific memory controller driver defines to
the appropriate tegra_def.h files, for future compatibility.

Change-Id: I3179fb771d8b32e913ca29bd94af95f4b2fc1961
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>