Revert "Revert "tegra: i2c: Enable new CONFIG_SYS_I2C framework""

This reverts commit 9026fe2ec81111b5d7f88debe110aff14011be29.
RFC: tegra: Avoid using I2C prior to relocation

Tegra recently moved to the new I2C framework, which sets up I2C prior to
relocation, and prior to calling i2c_init_board(). This causes a crash on
Tegra boards.

note:

There are many ways to fix this. I believe this is one. It disables i2c_init()
until relocation is complete. I have been unable to test it so far due to
problems getting my Seaboard to work. I will try another Tegra board, but
send this for comment in the meantime.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>