wil6210: pmc logger bug fix

When allocating pmc descriptor, the structure is
initially created on stack and later copied to
the physical ring (device) memory. The descriptor
structure must be initialized to zero to avoid
garbage configuration, which may result in pmc
mechanism malfunctioning.

Change-Id: I643f33a6376d3a6dd670d9b0b141d61c73ef125b
Signed-off-by: Vladimir Shulman <QCA_shulmanv@QCA.qualcomm.com>
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: 6cc6c468
Git-repo: https://github.com/kvalo/ath.git


Signed-off-by: Hamad Kadmany <hkadmany@codeaurora.org>