bullhead: remove ENABLE_CPUSETS

This flag is no longer used.

Change-Id: I02a6391c0a92489d5c81837841ab5dd8eaafaa2d
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 957de44..3a6a6c6 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -26,8 +26,6 @@
 TARGET_2ND_CPU_ABI2 := armeabi
 TARGET_2ND_CPU_VARIANT := cortex-a53.a57
 
-ENABLE_CPUSETS := true
-
 TARGET_NO_BOOTLOADER := true
 
 BOARD_KERNEL_BASE        := 0x00000000