dts: arm: Remove AES from the u575

Which does not have HW support for it, as stated by ST here:
https://www.st.com/en/microcontrollers-microprocessors/stm32u575-585.html



"
The STM32U575 portfolio offers from 1 to 2 Mbytes of flash memory
and from 48- to 169-pin packages.
The STM32U585 is available with 2 Mbytes of flash memory and provides
an additional encryption accelerator engine (AES, PKA, and OTFDEC).
"

All the U5 SoC have a hash HW accelerator (even the ones which don't
have crypto support: U535XX, U575XX, U59XXX and U5FXXX).
The hash node is therefore moved directly inside the stm32u5.dtsi.

Signed-off-by: Philémon Jaermann <p.jaermann@gmail.com>