smba1006_defconfig: Use USB_FSL_USB2 instead of USB_TEGRA
In old kernel we use USB_FSL_USB2. Try to enable it and see if GPS serial will start working.
Revert "smba1006_defconfig: Use USB_FSL_USB2 instead of USB_TEGRA"

This reverts commit 6806195417d19cdc67f72d0c3be31dbc31f3602f.

USB_FSL_USB2 breaks kernel build. Revert back to USB_TEGRA since it is the new driver introduced in 3.1.
board-smba1006-uart: Make pll_p first in uart_clk_parent
Colibri t20 board is using different set and order for uart_clk_parent.
Reference: http://git.toradex.com/gitweb/linux-toradex.git/blob/485b5d108fcf75a1066c5de054f8adf2e6118845:/arch/arm/mach-tegra/board-colibri_t20.c

Also do not set default debug port to 3 in case debug_port_id is not returned.
board-smba1006-clocks: Use clocks setup from old kernel