Add enumerant NYX_OS_INFO_ENCRYPTION_KEY_TYPE to nyx_os_info_query_t

:Release Notes:
Add a Nyx OS Info query NYX_OS_INFO_ENCRYPTION_KEY_TYPE that returns the
type of encryption key used for signing.

:Detailed Notes:
- This change introduces the enumerant
  NYX_OS_INFO_WEBOS_MANUFACTURING_VERSION as an alias for the now
  deprecated NYX_OS_INFO_MANUFACTURING_VERSION.
- Set version to v6.1.0 .

:Testing Performed:
Verified that with this change, nyx-modules is able to implement this
new query.

:Issues Addressed:
[ANG-9167] Add Nyx OS Info query for type of key used for signing

Open-webOS-DCO-1.0-Signed-off-by: Sapna Todwal <sapna.todwal@lge.com>

Change-Id: I8c6e47b2f0c84a60eed534d01c0f6371a50a520e
Reviewed-on: https://g2g.palm.com/5891
Reviewed-by: DCO Verification
Reviewed-by: Herb Kuta <herb.kuta@lge.com>
Tested-by: Sapna Todwal <sapna.todwal@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>
Merge branch 'develop'