ar71xx: merge patches [611-*,621-*] into 610-*

.../ar71xx/patches-3.8/610-MIPS-ath79-openwrt-machines.patch

...patches-3.8/611-MIPS-ath79-add-QCA9556-SoC-on-AP132.patch

...x/patches-3.8/612-MIPS-ath79-add-DIR-825-C1-support.patch

...x/patches-3.8/613-MIPS-ath79-add-TL-WDR3500-support.patch

...x/ar71xx/patches-3.8/614-MIPS-ath79-MR600v2-support.patch

...ux/ar71xx/patches-3.8/615-MIPS-ath79-RB951G-support.patch

...1xx/patches-3.8/616-MIPS-ath79-TL-MR3420-v2-support.patch

...1xx/patches-3.8/617-MIPS-ath79-TL-WR720N-v3-support.patch

...es-3.8/618-MIPS-ath79-add-Netgear-WNR2000v3-support.patch

...hes-3.8/619-MIPS-ath79-add-Netgear-WDNAP360-support.patch

...xx/patches-3.8/620-MIPS-ath79-add-Archer-C7-support.patch

...x/ar71xx/patches-3.8/621-MIPS-ath79-add-RB2011UAS-support

...linux/ar71xx/patches-3.8/902-unaligned_access_hacks.patch