clk: ingenic: Don't tag custom clocks with CLK_SET_RATE_PARENT

The custom clocks have custom functions to round, get or set their rate.
Therefore, we can't assume that they need the CLK_SET_RATE_PARENT flag.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20200903015048.3091523-4-paul@crapouillou.net


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