arm: dts: u8500: Update from Linux ux500-dts-for-v5.15

arm: dts: u8500: Update from Linux ux500-dts-for-v5.15

Update ste-dbx5x0.dtsi, ste-ab8500.dtsi and ste-ab8505.dtsi with
the changes made in upstream Linux. They are taken from
https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-nomadik.git/
branch "ux500-dts-for-v5.15" (pending merge for Linux 5.15).

The only relevant change for U-Boot here is
"ARM: dts: ux500: ab8500: Link USB PHY to USB controller node" [1]
which links the USB PHY to the USB controller. This is necessary on
U-Boot because the PHY driver is implemented as part of the generic
PHY subsystem that makes use of these bindings.

[1]: https://lore.kernel.org/linux-arm-kernel/20210709182234.47232-1-stephan@gerhold.net/

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>