configs/olpc_xo1: bump kernel version

Update kernel to version 5.7.1.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/olpc_xo1_defconfig

@@ -1,11 +1,11 @@
 BR2_x86_geode=y
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_6=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_7=y
 BR2_ROOTFS_POST_BUILD_SCRIPT="board/olpc/post-build.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
 BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/olpc/genimage.cfg"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.6"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.7.1"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/olpc/xo-1/linux.config"
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/olpc/linux.config"