clk: ux500: Drop .is_enabled state from PRCMU clocks

The core already keeps a software enable count. Drop this
custom software enable count.

Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220414221751.323525-3-linus.walleij@linaro.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>