Update change log and spec for wrt-plugins-tizen_0.4.38

Update change log and spec for wrt-plugins-tizen_0.4.38

[model] REDWOOD
[binary_type] PDA
[customer] OPEN

[Issue] N/A
[Problem] email conversation listener bug fix
[Cause] email conversation listener bug fix
[Solution] email conversation listener bug fix

[Issue] N/A
[Problem] find email has no mimeType for attachment
[Cause] mimeType is not set
[Solution] mimeType set for attachment

[Issue] N_SE-39969
[Problem] the settig of filter have a error in platform
[Cause] N/A
[Solution] modify the code to set the filter

[Systeminfo] Remove 'SYSTEM_INFO_KEY_CPS_SUPPORTED' key

[Issue] N/A
[Problem] Old notification privilege don't work
[Cause] backward compatibility was not guaranteed.
[Solution] inserted backward compatibility.

[team] WebAPI
[request] N/A
[horizontal_expansion] N/A