ca55: build_xenhypervisor: Countermeasure for build failure

Yocto build may fail by some issues such as memory shortage, network
connection issue and so on.
In that case, rebuild may be able to build image correctly.
This patch makes running build command again when build is failure.

Signed-off-by: Yuya Hamamachi <yuya.hamamachi.sx@renesas.com>

application_cpu/build_xenhypervisor.sh

@@ -107,7 +107,7 @@ moulin ./aos-rcar-gen4-wb.yaml \
     --BUILD_DOMD_SDK no \
     --USING_UFS_AS_STORAGE $USING_UFS \
     --ENABLE_DOMU $USING_DOMU
-ninja
+ninja || ninja
 ninja image-full
 mv -f full.img $1.${BOOT_DEV}.full.img
 gzip -f $1.${BOOT_DEV}.full.img