asoc: compress: Modify incorrect partial buffer size check

Due to incorrect check for buffer size calculation during partial buffer size check,
which is part of code for gapless playback support in GKI mode,
partial buffers are missed from sending to DSP causing buffer handling issues.

Change-Id: Ic6f5a3ce6958ddc94dc7bb7e92ebb778aa13cb64
Signed-off-by: Shalini Manjunatha <quic_c_shalma@quicinc.com>