configs/nitrogen7: Linux needs host-openssl

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/674934100

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

configs/nitrogen7_defconfig

@@ -39,3 +39,4 @@ BR2_LINUX_KERNEL_DEFCONFIG="boundary"
 BR2_LINUX_KERNEL_INSTALL_TARGET=y
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx7d-nitrogen7 imx7d-nitrogen7-m4"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y