Rename the ipq807x_v5.4 feed to qca-wifi-6 to align with the naming
convention used for qca-wifi-7. This change improves consistency and
better reflects the content, which encompasses WiFi 6 (802.11ax)
packages across various Qualcomm IPQ platforms (IPQ5018, IPQ6018,
IPQ8074, etc.).
Signed-off-by: John Crispin <john@phrozen.org>