This merges the existing GENERIC, GENERIC_1M, and GENERIC_512k boards
into variants of the new ESP8266_GENERIC board (renamed from GENERIC so
as not to clash with other ports).
Also moves the generation of the "OTA" variant (previously generated by
autobuild/build-esp8266-latest.sh) into the variant.
Following the convention established for the WEACTSTUDIO rp2 board, the
names of the variants are FLASH_1M and FLASH_512K (but rename the .ld files
to use MiB and kiB).
Updates autobuild to build esp8266 firmware the same way as other ports.
This requires renaming the output from firmware-combined.bin to just
firmware.bin.
This work was funded through GitHub Sponsors.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
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