coresight: move cp14.h to include/asm/hardware

Move cp14.h to include/asm/hardware so that it can be used by code
inside mach-msm as well as drivers/coresight.

Change-Id: I3f5cd6e1768378ec26abcd1e7328977836dce60f
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>