meta-aspeed: otptool: Multiple configurations

Enable generating multiple OTP binaries by specifying multiple OTP
configuration files.

Change-Id: I1ce81cd2c1d0f501578b927eb31cce5a37cdcf1f
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/meta-ibm/recipes-bsp/u-boot/u-boot-aspeed-sdk_2019.04.bbappend b/meta-ibm/recipes-bsp/u-boot/u-boot-aspeed-sdk_2019.04.bbappend
index 2a99328..12e9f88 100644
--- a/meta-ibm/recipes-bsp/u-boot/u-boot-aspeed-sdk_2019.04.bbappend
+++ b/meta-ibm/recipes-bsp/u-boot/u-boot-aspeed-sdk_2019.04.bbappend
@@ -2,7 +2,7 @@
 
 SRC_URI:append:p10bmc = " file://a3.json file://keys/"
 
-OTPTOOL_CONFIG:p10bmc = "${WORKDIR}/a3.json"
+OTPTOOL_CONFIGS:p10bmc = "${WORKDIR}/a3.json"
 OTPTOOL_KEY_DIR:p10bmc = "${WORKDIR}/keys/"
 
 # !!! Do not copy p10bmc's use of little-endian key ordering !!!