Set The Secure Version to 2 for P10 eBMC Builds

This commit sets the variable BR2_OPENPOWER_SIGNED_SECURITY_VERSION
in the p10ebmc_defconfig configuration to "2" from "0".  This new
value of 2 will be built into the secure headers of the lids.

Once a driver with this Secure Version of 2 is installed on a system,
a user will not be able to boot a driver with a Secure Version less
than 2 with security enabled.

Signed-off-by: Mike Baiocchi <baiocchi@ibm.com>
diff --git a/openpower/configs/p10ebmc_defconfig b/openpower/configs/p10ebmc_defconfig
index 5f2b256..0047788 100644
--- a/openpower/configs/p10ebmc_defconfig
+++ b/openpower/configs/p10ebmc_defconfig
@@ -81,4 +81,4 @@
 BR2_IMA_CATALOG_DTS="POWER10"
 BR2_PACKAGE_OCMB_EXPLORER_FW=y
 BR2_PACKAGE_IBM_FW_PROPRIETARY_P10=y
-BR2_OPENPOWER_SIGNED_SECURITY_VERSION="0"
+BR2_OPENPOWER_SIGNED_SECURITY_VERSION="2"