configs: Add cryptsetup support

Petitboot now supports opening encrypted partitions so include the
cryptsetup utility and required kernel options.
In particular this enables CRYPTO_XTS, CRYPTO_USER_API_HASH, and
CRYPTO_USER_API_SKCIPHER.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
diff --git a/openpower/configs/opal_defconfig b/openpower/configs/opal_defconfig
index fef8369..d83b0c9 100644
--- a/openpower/configs/opal_defconfig
+++ b/openpower/configs/opal_defconfig
@@ -23,6 +23,7 @@
 BR2_PACKAGE_LINUX_FIRMWARE=y
 BR2_PACKAGE_LINUX_FIRMWARE_BNX2X=y
 BR2_PACKAGE_LINUX_FIRMWARE_CXGB4_T4=y
+BR2_PACKAGE_CRYPTSETUP=y
 BR2_PACKAGE_IPMITOOL=y
 BR2_PACKAGE_IPMITOOL_USB=y
 BR2_PACKAGE_MDADM=y