core/linux-armv7: resolve dmesg spam issue with rt2800usb on Trimslice

This just adds the commit at https://git.kernel.org/cgit/linux/kernel/git/linville/wireless-testing.git/commit/drivers/net/wireless/rt2x00?id=45cfc51681287482c8b9843a20d6b4d06555ff62 to linux-armv7.

Without this commit, when the rt2800usb driver starts spamming the messages it affects, the wait time due to the serial console can cause the platform to enter a livelocked state where it's spending so much time writing messages on the serial console that it becomes unresponsive.