Set default value for double type when attributes are created

Set default value for double type when attributes are created

- The default value for double type is not set properly,
  because the field for default value is pointer type.
- This patch is a workaround, the problem should be fixed fundamentally later.

[Version] 0.2.117
[Profile] Common
[Issue Type] Bug fix
[Dependency module] N/A
[Test] [M(T) - Boot=(OK), sdb=(OK), Home=(OK), Touch=(OK), Version=tizen-unified_20181126.2]

Change-Id: Iad728887ef3c7e131857ef9a818c283ce3129618
Signed-off-by: Jeongmo Yang <jm80.yang@samsung.com>