configs/qemu_arm_ebbr: linux needs host-openssl

The kernel build needs host-openssl; add it to the configuration.

In practice the documented build recipe works fine and the build failures
can only be seen with highly parallel builds using per-package directories.

This fixes the following compilation error:

  certs/extract-cert.c:21:10: fatal error: openssl/bio.h: No such file or directory

Fixes: 7115ab39189a6c660745267d8bf0bf41cf8b3db7
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>
Cc: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/qemu_arm_ebbr_defconfig

@@ -19,6 +19,7 @@ BR2_LINUX_KERNEL_CUSTOM_VERSION=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.6.32"
 BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/qemu/arm-ebbr/linux.fragment"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
 
 # Packages
 BR2_PACKAGE_OPTEE_CLIENT=y