recipes-bsp: u-boot-fw-utils: Use full path in cl_setenv

Signed-off-by: Valentin Raevsky <valentin@compulab.co.il>

recipes-bsp/u-boot/compulab/imx8mm/cl_setenv

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 CONF=/etc/fw_env.config
+PREFIX=/sbin
 
 force_rw() {
 for _d in $(awk '(/^\/dev\//)&&($0=$1)' ${CONF});do
@@ -16,10 +17,10 @@ fi
 done
 }
 
-[[ -f ${CONF} ]] || fw_printenv -e > ${CONF}
+[[ -f ${CONF} ]] || ${PREFIX}/fw_printenv -e > ${CONF}
 
 force_rw 1
 
-fw_setenv $@
+${PREFIX}/fw_setenv $@
 
 force_rw 0