bullhead: disable ALLOC_IN_4K_CHUNKS.

Disable ALLOC_IN_4K_CHUNKS to try and keep unmovable pages
centralized. This should help avoid setting all pageblocks to unmovable.

bug 25392275

Change-Id: I95e3dd9aec9a772d85b54cf51764d31bf4d3be63

arch/arm64/configs/bullhead_defconfig

@@ -523,7 +523,6 @@ CONFIG_ANDROID_INTF_ALARM_DEV=y
 CONFIG_ONESHOT_SYNC=y
 CONFIG_ION=y
 CONFIG_ION_MSM=y
-CONFIG_ALLOC_BUFFERS_IN_4K_CHUNKS=y
 # CONFIG_NET_VENDOR_SILICOM is not set
 CONFIG_QCA_CLD_WLAN=y
 CONFIG_QCACLD_WLAN_LFR3=y