clk: stm32h7: fix test of clock config

fix test of composite clock config (bad copy / past)

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Fixes: 3e4d618b ("clk: stm32h7: Add stm32h743 clock driver")
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>