msm: pil: Handle reference counts correctly on boot failure

If load_image() returns an error we don't decrement the reference
count for the processor. This means that the processor is marked
as online even though it is not. Fix it.

Change-Id: I16b039deb8bf1dfb143d8d3b79629d5fd2828265
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>