soc: ti: pm33xx: Enable basic PM runtime support for genpd

stable inclusion
from stable-v5.10.180
commit a1e6a4161a27533cee2f678b97011f43886f937d
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8DDFN

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a1e6a4161a27533cee2f678b97011f43886f937d



--------------------------------

[ Upstream commit 74033131 ]

To prepare for moving to use genpd, let's enable basic PM
runtime support.

Cc: Dave Gerlach <d-gerlach@ti.com>
Cc: Santosh Shilimkar <ssantosh@kernel.org>
Cc: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Stable-dep-of: 8f3c307b ("soc: ti: pm33xx: Fix refcount leak in am33xx_pm_probe")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>