drm/panthor: record current and maximum device clock frequencies

drm/panthor: record current and maximum device clock frequencies

[ Upstream commit 37591ae11f89cdfc0a647945a589468642a44c17 ]

In order to support UM in calculating rates of GPU utilisation, the current
operating and maximum GPU clock frequencies must be recorded during device
initialisation, and also during OPP state transitions.

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240923230912.2207320-3-adrian.larumbe@collabora.com
Stable-dep-of: 21c23e4b64e3 ("drm/panthor: Fix OPP refcnt leaks in devfreq initialisation")
Signed-off-by: Sasha Levin <sashal@kernel.org>