ext: hal: nordic: Update nrfx to version 1.7.2

Update nrfx to the recently released version. See
https://github.com/NordicSemiconductor/nrfx/blob/v1.7.2/CHANGELOG.md
for a list of changes that this version introduces.

Origin: nrfx
License: BSD 3-Clause
URL: https://github.com/NordicSemiconductor/nrfx/tree/v1.7.2


commit: 13a7de7de72cfd444af468f11c0dbb9db7a26172
Purpose: Provide peripheral drivers for Nordic SoCs
Maintained-by: External

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>