ANDROID: sched/core: Fix arm32 allmodconfig build-break

The walt_update_task_ravg tracepoint does a do_div() but passes
an unsigned long * as the first argument instead of the required
uint64_t (see comments in include/asm-generic/div64.h).

This has existed in the android-4.9* kernels since 4.9.40, but
was an unnoticed warning for arm32 builds until kernelci recently
started flagging it as an error in allmoconfig builds.

Fixes: 4328ce34 ("ANDROID: trace/sched: add rq utilization signal for WALT")
Change-Id: I50759bcbdae23ffc4e3e265cd3cf648f7991cd84
Signed-off-by: Todd Kjos <tkjos@google.com>