cpu/esp8266: Add missing MCU_ESP8266 define for vendor code #20415
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Contribution description
Dropping the
MCU
variable in #20397 resulted in breaking the compilation of the vendor code in a non-obvious way. Adding aCFLAGS += -DMCU_ESP8266
specifically to the modules containing the vendor code that need this define fixes the issue.Testing procedure
ESP8266 should boot again
Issues/PRs references
Follow up to #20397
Alternative to #20409