[riot-notifications] [RIOT-OS/RIOT] cpu/stm32_common: enable EXTI interrupt for rtt (#11286)

Vincent Dupont notifications at github.com
Tue Mar 26 19:25:22 CET 2019

### Contribution description

This fixes rtt configuration (at least for stm32f4) by enabling EXTI interrupt. This is needed to wake up from stop mode.
stm32l4 and l0 should not be impacted as it seems EXTI is enabled by default on these cpus.

### Testing procedure

`tests/periph_rtt` with `CFLAGS += '-DPM_BLOCKER_INITIAL={ .val_u8[0]=1 }'` added in its Makefile.

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-- Commit Summary --

  * cpu/stm32_common: enable EXTI interrupt for rtt

-- File Changes --

    M cpu/stm32_common/periph/rtt.c (28)

-- Patch Links --


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