clk: en7523: Add clock for eMMC for EN7581

Add clock for eMMC for EN7581. This is used to give info of the current
eMMC source clock and to switch it from 200MHz or 150MHz.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/20250113231030.6735-5-ansuelsmth@gmail.com


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