Fix type conversion bug in utils class

When vendor implementing the application setting using media quality
framework, type conversion bug occured for some picture parameters.

Bug: 403604865
Flag: android.media.tv.flags.media_quality_fw_bugfix
Test: atest CtsMediaQualityTestCases

Change-Id: I66f951f6b2d5dd71d2bbf5db2f9b647d5bb1e58f