msm: camera: icp: Remove redundant update of size field

Previously the size_in_words parameter in hfi_read held only
the size of one message packet. This change removes assigning
this field to size of one message packet as it is overwritten
with the re-calculated size of all packets present in the
queue at that instant.

Change-Id: I4421d7429551f7dfdb2c197ecd3e1d466687bb09
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>