use NO_HZ and 256HZ clock

target/linux/ar71xx/config-3.3

@@ -99,13 +99,13 @@ CONFIG_CPU_SUPPORTS_HIGHMEM=y
 CONFIG_CSRC_R4K=y
 CONFIG_CSRC_R4K_LIB=y
 CONFIG_DECOMPRESS_LZMA=y
-CONFIG_DEFAULT_WESTWOOD=y
 # CONFIG_DEFAULT_BIC is not set
 # CONFIG_DEFAULT_CUBIC is not set
 # CONFIG_DEFAULT_HTCP is not set
 # CONFIG_DEFAULT_HYBLA is not set
 # CONFIG_DEFAULT_VEGAS is not set
 # CONFIG_DEFAULT_VENO is not set
+CONFIG_DEFAULT_WESTWOOD=y
 CONFIG_DMA_NONCOHERENT=y
 CONFIG_EARLY_PRINTK=y
 CONFIG_GENERIC_ATOMIC64=y
@@ -143,6 +143,9 @@ CONFIG_HAVE_MEMBLOCK_NODE_MAP=y
 CONFIG_HAVE_OPROFILE=y
 CONFIG_HAVE_PERF_EVENTS=y
 CONFIG_HW_HAS_PCI=y
+CONFIG_HZ=256
+# CONFIG_HZ_100 is not set
+CONFIG_HZ_256=y
 CONFIG_I2C=y
 CONFIG_I2C_ALGOBIT=y
 CONFIG_I2C_BOARDINFO=y
@@ -189,6 +192,7 @@ CONFIG_NET_DSA_MV88E6063=y
 CONFIG_NET_DSA_TAG_TRAILER=y
 CONFIG_NET_VENDOR_TOSHIBA=y
 CONFIG_NO_GENERIC_PCI_IOPORT_MAP=y
+CONFIG_NO_HZ=y
 CONFIG_PAGEFLAGS_EXTENDED=y
 CONFIG_PCI=y
 CONFIG_PCI_AR724X=y