drivers: thermal: Fix compile warnings

Fix the following compiler warning(s) from gcc 6.1.1 with -Werror enabled:

 drivers/thermal/qcom/cpu_isolate.c:275:
   format '%ld' expects argument of type 'long int', but argument 3 has
	type 'int' [-Werror=format=]
   pr_err("Cooling register failed for %s, ret:%ld\n",

Fixes: b2b2111a ("drivers: thermal: Add support for cpu isolation cooling device")
Change-Id: Ic0dedbad6f5ab0e1973247129f85b07f245e84bc
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>