imx: tpc70: Convert TPC70 (imx6q) board to use DM/DTS in SPL and u-boot

This patch converts the TPC70 to use driver model and device tree
description in both SPL and u-boot proper.

Notable changes (DM/DTS conversion):

- PINCTRL{_IMX6}
- DM_I2C
- enable 'regulator' and 'pmic' commands
- DM_MMC and BLK (USDHC)
- DM_ETH
- DM WDT (including SYSRESET)

Signed-off-by: Lukasz Majewski <lukma@denx.de>
5 files changed