patches/openwrt: kernel: update to version 4.14.278

In this kernel version 4.14.278, there are backported fixes for aardvark
driver, which is used in Turris MOX. That's why I dropped revert patch
related to it as with kernel 4.14.276, there were reported issue, when
miniPCIe card - Compex WLE900VX did not work.

Reference:
#344
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