sched: Resolve some 64 bit compilation issues

On 64 bit architectures a pointer is no longer the same size as an
int. Therefore any place that does a conversion from int to a pointer
type gives a compilation error. Resolve these by type casting to long
first which is guaranteed to be the same size as a pointer.

Change-Id: I518ac3c562bd3f85893f91ad6dbcd2f0c7bf081b
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>