commands: include missing header

When compiled for ARCH=sandbox, we get a compiler warning
if we don't include the needed header file as well.

Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
imx6:phyFLEX: Fix ENTRY_FUNCTION

For some phyFLEX-i.MX6 modules the call __barebox_arm_head() was not removed.
With this function the barebox does not start.

Signed-off-by: Christian Hemp <christian.hemp@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>