Revert "soong_config: Add flag for devices use metadata as FDE key"

* Qcom reverted the relevant commit in cryptfs_hw

This reverts commit a4d6ce67e76769bea45a1538c3e2d52b12dd9a38.

Change-Id: Ife1812ebc80946953e3d1a558617c94ddbc7fad4
diff --git a/build/soong/android/variable.go b/build/soong/android/variable.go
index ed08933..a8b0ee7 100644
--- a/build/soong/android/variable.go
+++ b/build/soong/android/variable.go
@@ -40,9 +40,6 @@
 	Uses_generic_camera_parameter_library struct {
 		Srcs []string
 	}
-	Uses_metadata_as_fde_key struct {
-		Cflags []string
-	}
 	Uses_nvidia_enhancements struct {
 		Cppflags []string
 	}
@@ -89,7 +86,6 @@
 	Target_process_sdk_version_override  *string `json:",omitempty"`
 	Target_shim_libs  *string `json:",omitempty"`
 	Uses_generic_camera_parameter_library  *bool `json:",omitempty"`
-	Uses_metadata_as_fde_key  *bool `json:",omitempty"`
 	Uses_nvidia_enhancements  *bool `json:",omitempty"`
 	Uses_qcom_bsp_legacy  *bool `json:",omitempty"`
 	Uses_qti_camera_device  *bool `json:",omitempty"`
diff --git a/build/soong/soong_config.mk b/build/soong/soong_config.mk
index b5b753e..7fa7e7c 100644
--- a/build/soong/soong_config.mk
+++ b/build/soong/soong_config.mk
@@ -17,7 +17,6 @@
 $(call add_json_str_omitempty, Target_process_sdk_version_override, $(TARGET_PROCESS_SDK_VERSION_OVERRIDE))
 $(call add_json_str_omitempty, Target_shim_libs, $(subst $(space),:,$(TARGET_LD_SHIM_LIBS)))
 $(call add_json_bool, Uses_generic_camera_parameter_library, $(if $(TARGET_SPECIFIC_CAMERA_PARAMETER_LIBRARY),,true))
-$(call add_json_bool, Uses_metadata_as_fde_key, $(filter true,$(TARGET_USES_METADATA_AS_FDE_KEY)))
 $(call add_json_bool, Uses_nvidia_enhancements, $(filter TRUE,$(NV_ANDROID_FRAMEWORK_ENHANCEMENTS)))
 $(call add_json_bool, Uses_qcom_bsp_legacy, $(filter true,$(TARGET_USES_QCOM_BSP_LEGACY)))
 $(call add_json_bool, Uses_qti_camera_device, $(filter true,$(TARGET_USES_QTI_CAMERA_DEVICE)))