warp7: add warp7_auth_or_fail

Doing secure boot on the WaRP7 using a common image format and the same
variable to represent the base address for each call means we can reduce
down the command to a single environment command.

This patch adds warp7_auth_or_fail as a wrapper around
"hab_auth_img_or_fail ${hab_ivt_addr} ${filesize} 0".

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Tested-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

include/configs/warp7.h

@@ -50,6 +50,7 @@
 	"finduuid=part uuid mmc 0:${rootpart} uuid\0" \
 	"mmcargs=setenv bootargs console=${console},${baudrate} " \
 		"root=PARTUUID=${uuid} rootwait rw\0" \
+	"warp7_auth_or_fail=hab_auth_img_or_fail ${hab_ivt_addr} ${filesize} 0;\0" \
 	"loadbootscript=" \
 		"load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};\0" \
 	"bootscript=echo Running bootscript from mmc ...; " \