clk: bcm: rpi: Allow cpufreq driver to also adjust gpu clocks

clk: bcm: rpi: Allow cpufreq driver to also adjust gpu clocks

For performance/power it is beneficial to adjust gpu clocks with arm clock.
This is how the downstream cpufreq driver works

Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://lore.kernel.org/r/20250116-bcm2712-clk-updates-v1-2-10bc92ffbf41@raspberrypi.com
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>