[riot-notifications] [RIOT-OS/RIOT] cpu/esp*: Fix cast alignment issues (#15464)

[Marian Buschsieweke]

### Contribution description

- Add `WORD_ALIGNED` attribute to potentially unaligned allocations
- Use intermediate cast to `uintptr_t` to silence false positives of `-Wcast-align`

### Testing procedure

Hopefully, the allocations previously missing the `WORD_ALIGNED` attribute ended up word aligned by luck, so binaries don't change. Otherwise, this fixes a bug.

### Issues/PRs references

Needed for https://github.com/RIOT-OS/RIOT/pull/14955
You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/15464

-- Commit Summary --

  * cpu/esp*: Fix cast alignment issues

-- File Changes --

    M cpu/esp8266/vendor/Makefile (3)
    M cpu/esp_common/periph/flash.c (15)
    M cpu/esp_common/thread_arch.c (16)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/15464.patch
https://github.com/RIOT-OS/RIOT/pull/15464.diff

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