composer: Initialize ColorMetadata transfer as sRGB

- SetCSC function does not assign transfer value, "transfer=0" is used
  as the default initialization which leads to incorrect UI layers
  color conversion. So initialize ColorMetadata transfer as sRGB.

Change-Id: I2476a36cba00a50c394b275c40242eee0cc0bcac
CRs-Fixed: 2574361
1 file changed