arm: dts: Add coherent_pool=1M to Pi 4 bootargs
Downstream Raspberry Pi dts files add "coherent_pool=1M" to the kernel command line to aid the dwc_otg driver, but this excluded Pi 4 which uses a new XCHI interface instead. UAS also benefits from a larger coherent_pool value, so replicate the addition in bcm2711-rpi-4-b.dts. See: https://github.com/raspberrypi/linux/pull/3040 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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