meta-nuvoton: enable module signature verification

Nuvoton targets requires loadable modules support.

Add the following config options:

  * MODULE_SIG
  * MODULE_SIG_SHA512

Signed-off-by: Anton D. Kachalov <gmouse@google.com>
Change-Id: Ieb5382fa7087be6ecd118eeaea9b9372cb75b861
diff --git a/meta-nuvoton/recipes-kernel/linux/linux-nuvoton/defconfig b/meta-nuvoton/recipes-kernel/linux/linux-nuvoton/defconfig
index 2ba9062..cbc3fd2 100644
--- a/meta-nuvoton/recipes-kernel/linux/linux-nuvoton/defconfig
+++ b/meta-nuvoton/recipes-kernel/linux/linux-nuvoton/defconfig
@@ -16,6 +16,8 @@
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_MODVERSIONS=y
+CONFIG_MODULE_SIG=y
+CONFIG_MODULE_SIG_SHA512=y
 CONFIG_PARTITION_ADVANCED=y
 CONFIG_BINFMT_MISC=y
 CONFIG_NET=y