bmips: add new target

This target has full device tree support, thus reducing the number of
patches needed for bcm63xx, in which there's a patch for every board.

The intention is to start with a minimal amount of downstream patches and
start upstreaming all of them.

Current status:
 - Enabling EHCI/OHCI on BCM6358 causes a kernel panic.
 - BCM63268 lacks Timer Clocks/Reset support.
 - No PCI/PCIe drivers.
 - No ethernet drivers.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Acked-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/bmips/files/include/dt-bindings/interrupt-controller/bcm6358-interrupt-controller.h

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef __DT_BINDINGS_INTERRUPT_CONTROLLER_BCM6358_H
+#define __DT_BINDINGS_INTERRUPT_CONTROLLER_BCM6358_H
+
+#define BCM6358_IRQ_TIMER		0
+#define BCM6358_IRQ_SPI			1
+#define BCM6358_IRQ_UART0		2
+#define BCM6358_IRQ_UART1		3
+#define BCM6358_IRQ_OHCI		5
+#define BCM6358_IRQ_EMAC1		6
+#define BCM6358_IRQ_USBS		7
+#define BCM6358_IRQ_EMAC0		8
+#define BCM6358_IRQ_EPHY		9
+#define BCM6358_IRQ_EHCI		10
+#define BCM6358_IRQ_USB_CTL_RX_DMA	11
+#define BCM6358_IRQ_USB_CTL_TX_DMA	12
+#define BCM6358_IRQ_USB_BULK_RX_DMA	13
+#define BCM6358_IRQ_USB_BULK_TX_DMA	14
+#define BCM6358_IRQ_EMAC0_RX_DMA	15
+#define BCM6358_IRQ_EMAC0_TX_DMA	16
+#define BCM6358_IRQ_EMAC1_RX_DMA	17
+#define BCM6358_IRQ_EMAC1_TX_DMA	18
+#define BCM6358_IRQ_ATM		        19
+#define BCM6358_IRQ_EXT4		20
+#define BCM6358_IRQ_EXT5		21
+#define BCM6358_IRQ_PCM			22
+#define BCM6358_IRQ_PCM_RX_DMA		23
+#define BCM6358_IRQ_PCM_TX_DMA		24
+#define BCM6358_IRQ_EXT0		25
+#define BCM6358_IRQ_EXT1		26
+#define BCM6358_IRQ_EXT2		27
+#define BCM6358_IRQ_EXT3		28
+#define BCM6358_IRQ_ADSL		29
+#define BCM6358_IRQ_DG			30
+#define BCM6358_IRQ_MPI			31
+
+#endif /* __DT_BINDINGS_INTERRUPT_CONTROLLER_BCM6358_H */