DPPI is not able to build with SDK 2.8.
The issue seems to be the NRF54L15 has 4 DPPI peripherals, yet the NRFX hal version 2.8 only works with one.
// Driver for single instance DPPI #if NRFX_CHECK(NRFX_DPPI_ENABLED) && (!defined(DPPIC_COUNT) || (DPPIC_COUNT == 1))
Would it be recommended to clone the latest release of the NRFX hal to get support for the 54L15?