Enable SH7 build

.github/workflows/build.yml

@@ -97,6 +97,8 @@ jobs:
             nk: edsh5exe.bin
           - model: sh6
             nk: edsh6exe.bin
+          - model: sh7
+            nk: edsh7exe.bin
 
     steps:
       - uses: actions/checkout@v2

image/build_image.sh

@@ -9,7 +9,7 @@ IMG=${REPO}/image/sd.img
 
 mkdir -p ${WORK}
 
-for i in $(seq 1 6); do
+for i in $(seq 1 7); do
     make -C ${REPO}/u-boot-brain pwsh${i}_defconfig
     make -j${JOBS} -C ${REPO}/u-boot-brain u-boot.bin
     ${REPO}/nkbin_maker/bsd-ce ${REPO}/u-boot-brain/u-boot.bin