configs/riotboard: add missing dependency on host-openssl

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/123771135

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/riotboard_defconfig

@@ -27,6 +27,7 @@ BR2_LINUX_KERNEL_DEFCONFIG="imx_v6_v7"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6dl-riotboard"
 BR2_LINUX_KERNEL_INSTALL_TARGET=y
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
 
 # required tools to create the SD card image
 BR2_PACKAGE_HOST_DOSFSTOOLS=y