bullhead_defconfig: set CONFIG_HZ to 1000

Increase CONFIG_HZ in order to improve UI responsiveness, especially
when there is significant background CPU work.

bug 25347271

Change-Id: If2d77233ea333d1be8facb8c35f8241aa9e2fd6e

arch/arm64/Kconfig

@@ -431,9 +431,7 @@ config SWP_EMULATE
 
 	  If unsure, say Y.
 
-config HZ
-	int
-	default 100
+source kernel/Kconfig.hz
 
 config ARCH_HAS_HOLES_MEMORYMODEL
 	def_bool y if SPARSEMEM

arch/arm64/configs/bullhead_defconfig

@@ -38,6 +38,7 @@ CONFIG_SCHED_MC=y
 CONFIG_ARCH_WANTS_CTXSW_LOGGING=y
 CONFIG_NR_CPUS=6
 CONFIG_PREEMPT=y
+CONFIG_HZ_1000=y
 CONFIG_ARMV7_COMPAT=y
 CONFIG_BALANCE_ANON_FILE_RECLAIM=y
 CONFIG_ZSMALLOC=y