Revert "Enable hardware backed disk encryption"

This reverts commit b844a8eae6d70c6bcf85dbb85b9789a914001153.

Change-Id: I15436c7cb4dab854137b6b4a79c00dfb67a1383d
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 1da1a06..b62a927 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -78,7 +78,7 @@
 VSYNC_EVENT_PHASE_OFFSET_NS := 7500000
 SF_VSYNC_EVENT_PHASE_OFFSET_NS := 5000000
 TARGET_USES_ION := true
-TARGET_HW_DISK_ENCRYPTION := true
+TARGET_HW_DISK_ENCRYPTION := false
 TARGET_CRYPTFS_HW_PATH := device/moto/shamu/cryptfs_hw
 
 # Enable dex-preoptimization to speed up first boot sequence