Set TARGET_2ND_ARCH_VARIANT to armv8-a

Bullhead is armv8 device. Setting TARGET_2ND_ARCH_VARIANT to armv8-a,
instead of armv7-a-neon, can silence the related warning during build.

Bug: 68012286
Test: lunch aosp_bullhead; make -j
Change-Id: I0989c3d4185334dbfe0a3d79d3595d8dff8abd2b
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 5aa9f3b..b256fa0 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -21,7 +21,7 @@
 TARGET_CPU_VARIANT := cortex-a53
 
 TARGET_2ND_ARCH := arm
-TARGET_2ND_ARCH_VARIANT := armv7-a-neon
+TARGET_2ND_ARCH_VARIANT := armv8-a
 TARGET_2ND_CPU_ABI := armeabi-v7a
 TARGET_2ND_CPU_ABI2 := armeabi
 TARGET_2ND_CPU_VARIANT := cortex-a53.a57