MLK-9975-2 imx6sx-ard: fix CAN unwork if power up the borad on first time

The CAN transceiver on MX6SX Sabreauto board seems in sleep mode
by default after power up the board. User has to press the wakeup
key on ARD baseboard before using the transceiver, or it may not
work properly when power up the board at the first time(warm reset
does not have such issue).

This patch wakeup the transceiver firstly if needed during intialization
by control the wakeup pin, then user do not have to press wakeup key
button to enable the transceiver.
BTW, stby gpio is also updated which is wrong before.

Conflicts:

	arch/arm/mach-imx/mach-imx6sx.c

Signed-off-by: Dong Aisheng <b29396@freescale.com>
(cherry picked from commit 3141bfc97e667de4b3d88968aa18668699d735ea)
(cherry picked from commit 05eb2a0b27d37740ba6cc4769b095706c064d823)