Update the 32 bit cpu variant to cortex-a53.a57.

Change-Id: Iddfe0168af23c1b106c4ef4bca6573915f0eebc2
diff --git a/BoardConfig.mk b/BoardConfig.mk
index ab8da52..60989d0 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -27,7 +27,7 @@
 TARGET_2ND_ARCH_VARIANT := armv7-a-neon
 TARGET_2ND_CPU_ABI := armeabi-v7a
 TARGET_2ND_CPU_ABI2 := armeabi
-TARGET_2ND_CPU_VARIANT := cortex-a7
+TARGET_2ND_CPU_VARIANT := cortex-a53.a57
 
 ENABLE_CPUSETS := true