MLK-16703: HAB : Check if CSF is valid before authenticating image

MLK-16703: HAB : Check if CSF is valid before authenticating image

For proper authentication users must check if the CSF is valid. This patch
calls the csf_is_valid function prior to authenticating the image to parse
the CSF and returns a failure if an invalid command is found as shown below.

	Authenticate image from DDR location 0x12000000...
	Check CSF for Write Data command before authenticating image

	Error - WRITE Data command found

	Authenticate zImage Fail, Please check

Signed-off-by: Utkarsh Gupta <utkarsh.gupta@nxp.com>