expat added and updated to kernel 4.19.23

config/buildroot_bbb.patch

@@ -687,7 +687,7 @@ index 0000000000..d498df07e3
 + 	gpmc_init();
 diff --git a/configs/bbb-heiafr_defconfig b/configs/bbb-heiafr_defconfig
 new file mode 100644
-index 0000000000..7500799cdd
+index 0000000000..7ccc49fb6c
 --- /dev/null
 +++ b/configs/bbb-heiafr_defconfig
 @@ -0,0 +1,81 @@
@@ -702,12 +702,11 @@ index 0000000000..7500799cdd
 +BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/bbb-heiafr/genimage.cfg"
 +BR2_LINUX_KERNEL=y
 +BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.19.21"
++BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.19.23"
 +BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 +BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/bbb-heiafr/linux_defconfig"
 +BR2_LINUX_KERNEL_DTS_SUPPORT=y
 +BR2_LINUX_KERNEL_INTREE_DTS_NAME="am335x-boneblack"
-+BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT=y
 +BR2_PACKAGE_LINUX_TOOLS_CPUPOWER=y
 +BR2_PACKAGE_LINUX_TOOLS_PERF=y
 +BR2_PACKAGE_LINUX_TOOLS_PERF_TUI=y
@@ -740,6 +739,7 @@ index 0000000000..7500799cdd
 +BR2_PACKAGE_MICROPYTHON_LIB=y
 +BR2_PACKAGE_LIBZIP=y
 +BR2_PACKAGE_CJSON=y
++BR2_PACKAGE_EXPAT=y
 +BR2_PACKAGE_JSON_C=y
 +BR2_PACKAGE_JSON_FOR_MODERN_CPP=y
 +BR2_PACKAGE_LIBYAML=y