Align Raspberry Pi DMA interrupts with Linux DTS

Align Raspberry Pi DMA interrupts with Linux DTS

There is nothing in the specs on DMA engine interrupt lines: it should have
been in the "BCM2835 ARM Peripherals" datasheet but the appropriate
"ARM peripherals interrupt table" (p.113) is nearly empty.

All Raspberry Pi models 1-3 (based on bcm2835) have
Linux device tree (arch/arm/boot/dts/bcm2835-common.dtsi +25):

    /* dma channel 11-14 share one irq */

This information is repeated in the driver code
(drivers/dma/bcm2835-dma.c +1344):

    /*
     * in case of channel >= 11
     * use the 11th interrupt and that is shared
     */

In this patch channels 0--10 and 11--14 are handled separately.

Signed-off-by: Andrey Makarov <andrey.makarov@auriga.com>
Message-id: 20220716113210.349153-1-andrey.makarov@auriga.com
[PMM: fixed checkpatch nits]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>