board: promote Luckfox Nova to supported

[crackerjacques]

Following the 26.08 release announcement (#10336) inviting maintainers to
promote well-working CSC boards to Supported.

The Luckfox Nova (RK3308B) has been in the tree since #9985. It boots and
works well on the 26.08 primary kernel — current (6.18) — as well as edge
(7.1): internal mic/codec, PDM digital mic, AIC8800 WiFi (Nova W), eMMC, and the
GPIO header. Renamed config/boards/luckfox-rk3308b-nova.csc → .conf;
BOARD_VENDOR is already lowercase and BOARD_MAINTAINER is set to my handle.

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[github-actions]

✅ This PR has been reviewed and approved — all set for merge!