mediatek: Update targets from MTK Wi-Fi 7 AP v8.3.1.3 MT7987/90 "3.0" SDK

The following areas of the mediatek target were touched:

• filogic/config-5.4
• files-5.4
• modules.mk
• base-files/

Changes taken from MTK Wi-Fi 7 AP v8.3.1.3 / 3.0 with versions described in MT7987 & MT7990 MediaTek Wi-Fi 7 Software Development Kit Release Note v3.0.pdf

• mtk-wifi-mt7987-mt7990-mt7992-mt7993-v8.3.1.3_SDK-20250919-external.tar.xz SHA256: e1814c2a6726fcf694e452ffc6959a26cf8d5ab0218a246b821ecda3ebbd0119
• src-git mtk_openwrt_feed https://git01.mediatek.com/openwrt/feeds/mtk-openwrt-feeds^593bd81
• src-git packages https://git.openwrt.org/feed/packages.git^1be343f
• src-git luci https://git.openwrt.org/project/luci.git^e4c4633
• src-git routing https://git.openwrt.org/feed/routing.git^a9e4310