[arm64]: add kconfig force inclusion for COMPAT_VSDO

Kernel support for 32-bit EL0 (COMPAT) [Y/n/?] y
  Enable kuser helpers page for 32-bit applications (KUSER_HELPERS) [Y/n/?] y
  Enable vDSO for 32-bit applications (COMPAT_VDSO) [Y/n/?] (NEW)

make -C olddefconfig will clear the this kconfig. thus, introduce
force_inclusion file and directly add the kconfig without further check.

Signed-off-by: Guohan Lu <lguohan@gmail.com>

manage-config

@@ -61,7 +61,8 @@ function get_section_opts(){
 ret=0
 exclusion_file="../patch/kconfig-exclusions"
 inclusion_file="../patch/kconfig-inclusions"
-if [ -e ${exclusion_file} -o -e ${inclusion_file} ]; then
+force_inclusion_file="../patch/kconfig-force-inclusions"
+if [ -e ${exclusion_file} -o -e ${inclusion_file} -o -e ${force_inclusion_file} ]; then
 
     # Process any exclusions in the kernel
     if [ -f ${exclusion_file} ]; then
@@ -124,6 +125,16 @@ if [ -e ${exclusion_file} -o -e ${inclusion_file} ]; then
         fi
     fi
 
+    # Process any force inclusions in the kernel
+    if [ -f ${force_inclusion_file} ]; then
+        force_inclusion_opts=$(get_section_opts ${force_inclusion_file} "common" ${ARCH} ${PLATFORM})
+        while read -r opt; do
+            if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
+                echo $opt >> ${CONFIG_FILE}
+            fi
+        done <<< ${force_inclusion_opts};
+    fi
+
     echo
 fi
 

patch/kconfig-force-inclusions

@@ -0,0 +1,3 @@
+[arm64]
+CONFIG_COMPAT_VDSO=y
+CONFIG_THUMB2_COMPAT_VDSO=y