msm: rq_stats: Fix lockdep warnings with key's not in .data

Sysfs attributes have lockdep keys and so they should exist in
the data section. Failure to do this results in lockdep turning
itself off and warnings such as:

	BUG: key eeb0883c not in .data!

Fix this problem by statically allocating the attributes.

Change-Id: I30202d8ed561c766ecd2c86657117282e2e25fd1
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>