qseecom: Release ion buffer in case of keymaster TA

For Keymaster TA we are not going to add it in to unload pending list
as we should not unload keymaster TA and as soon as unload request come
we should release Buffer and return.

Change-Id: Icba33195794aacde1c3b3ade5432fabbc27db608
Signed-off-by: Nitin LNU <quic_nlakra@quicinc.com>
Signed-off-by: Nageswara reddy Karnati <quic_nkarnati@quicinc.com>