[FS#2428] ath79: sysupgrade will brick devices with RedBoot bootloader

[OpenWrt Bugs]

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FS#2428 - ath79: sysupgrade will brick devices with RedBoot bootloader
User who did this - tmn505 (tmn505)

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For anyone involved, this patch fixes the bug:
[[https://patchwork.ozlabs.org/project/openwrt/patch/20200805211354.3922-1-git@johnthomson.fastmail.com.au|kernel: fix mtd partition erase