soc: nordic: nrf54l: Remove redundant option

The option SOC_NRF54L_GLITCHDET_WORKAROUND is not
needed anymore becuase the glitch detector is already
disabled in the Nordic MDK in the hal_nordic repo.

File path in hal_nordic:
nrfx/mdk/system_nrf54l.c

Signed-off-by: Georgios Vasilakis <georgios.vasilakis@nordicsemi.no>