msdk: remove unnecessary assignment

CodecProfile will be set in MFXVideoDECODE_DecodeHeader() to match
the input stream. Setting the hard-coded profile here will mislead
user that msdkh265dec supports a special profile only.
3 jobs for hevc10 in 6 minutes and 44 seconds (queued for 36 minutes and 46 seconds)
Status Job ID Name Coverage
  Preparation
passed #50616
manifest

00:00:25

 
  Build
passed #50617
build fedora x86_64

00:02:02

 
  Full Builds
passed #50618
build android arm64 api28

00:04:16