modules: update openwrt

a527b34390 build: do not depend on $(STAGING_DIR)/.prepared when in SDK
e87be1bc0e bcm27xx: base-files: fix platform_copy_config
81f8b93e36 build: add $(STAGING_DIR) and $(BIN_DIR) preparation to target and package subdir compile dependencies
c8898f46f9 kernel: lantiq: ltq-vmmc: introduce user group for vmmc
37c2bc4397 mediatek: fixes for Ethernet on MT7988 SoC
9627654277 mediatek: Cetron CT3003: fixes typo for spi properties
6bec68062b mediatek: add Zyxel EX5601-T0 with uboot custom partition
e2954a1e1b mediatek: Add support for TP-Link EAP225v5
f555fa6fd0 mediatek: Add support for D-Link EAGLE PRO AI M32
5b4df9a27e mediatek: add support for Buffalo WSR-3200AX4S
65f9f3131e mediatek: separate dts/dtsi for Buffalo WSR series
882d20e25b mediatek: merge trx helpers in image/mt7622.mk
a26ea17294 mediatek: drop pwm7_pins from Buffalo WSR-2533DHP2
9c793c44c9 mediatek: add label-mac-device for Buffalo WSR-2533DHP2
7e47913ef6 mediatek: update NVMEM bindings for Buffalo WSR-2533DHP2
04ec453970 mediatek: update LED/Key bindings for Buffalo WSR-2533DHP2
91ef14a487 mediatek: mt7981: improve fan behaviour