Enable scheduler boost for zygote.

bug 21915482

Change-Id: I05007301cee64ec89d6ee66db9ed732d15e61445
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 3c7fa49..30e3d88 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -27,6 +27,7 @@
 TARGET_2ND_CPU_VARIANT := cortex-a7
 
 ENABLE_CPUSETS := true
+ENABLE_SCHED_BOOST := true
 
 TARGET_NO_BOOTLOADER := true