UPSTREAM: PM: domains: fix integer overflow issues in genpd_parse_state()

Currently, while calculating residency and latency values, right
operands may overflow if resulting values are big enough.

To prevent this, albeit unlikely case, play it safe and convert
right operands to left ones' type s64.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Bug: 296029082
Fixes: 30f60428 ("PM / Domains: Allow domain power states to be read from DT")
Change-Id: Id0355d95ff18dc2273fca719aa64e2d32b1f9da5
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit e5d1c872)
Signed-off-by: Daniel Mentz <danielmentz@google.com>