dts: st: stm32u5: restore correct `clocks` on multi-bit devices

During the transition to STM32_CLOCK macro (in 57723cf4), the `clocks`
property of peripherals requiring more than one bit to be set were
mistakenly modified. Commit 2c3294b0
partially fixed these errors, but some nodes for the U5 series are still
wrong.

Restore `clocks` on affected devices in corresponding STM32U5 DTSI.

Fixes: 57723cf4
Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>