qcacmn: Remove redundant qdf_mem_zero calls

qcacmn to qcacmn-2.0 propagation

qdf_mem_zero is called after qdf_mem_malloc to set the memory
value to zero. qdf_mem_malloc uses kzalloc internally to allocate
memory which sets memory to zero.

Removing redundant qdf_mem_zero which are called after
qdf_mem_malloc.

Change-Id: I8e1faf6099f8fbc869c8af42b7511a13e66e6bed
CRs-Fixed: 1079697
7 files changed