configs/beaglebone: kernel builds needs host-openssl

Fixes:

514 scripts/extract-cert.c:21:25: fatal error: openssl/bio.h: No such file or directory
515  #include <openssl/bio.h>

Seen at:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/378314247

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/beaglebone_defconfig

@@ -11,6 +11,7 @@ BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,beagleboard,linux,4.19.7
 BR2_LINUX_KERNEL_DEFCONFIG="omap2plus"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="am335x-evm am335x-bone am335x-boneblack am335x-bonegreen am335x-evmsk am335x-boneblue"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
 BR2_TARGET_UBOOT=y