ARM: dts: msm: Correct the PC Debug counters IMEM address for MSM8994

The PC Debug counters are saved to IMEM. Correct the address at which
these counter reside.

Change-Id: I4c75762eac149167546ccbc968095a4e2e7cb1e2
Signed-off-by: Karthik Parsha <kparsha@codeaurora.org>