hw/riscv/riscv-iommu.h: add missing headers

This header is incomplete, i.e. it is using definitions that are being
supplied by the .c files that are including it.

Adding this header into a fresh .c file will result in errors:

/home/danielhb/work/qemu/hw/riscv/riscv-iommu.h:30:17: error: field ‘parent_obj’ has incomplete type
   30 |     DeviceState parent_obj;
      |                 ^~~~~~~~~~
/home/danielhb/work/qemu/hw/riscv/riscv-iommu.h:50:5: error: unknown type name ‘dma_addr_t’; did you mean ‘in_addr_t’?
   50 |     dma_addr_t cq_addr;   /* Command queue base physical address */
      |     ^~~~~~~~~~
      |     in_addr_t
(...)
/home/danielhb/work/qemu/hw/riscv/riscv-iommu.h:62:5: error: unknown type name ‘QemuThread’; did you mean ‘GThread’?
   62 |     QemuThread core_proc; /* Background processing thread */
      |     ^~~~~~~~~~
      |     GThread
/home/danielhb/work/qemu/hw/riscv/riscv-iommu.h:63:5: error: unknown type name ‘QemuCond’
   63 |     QemuCond core_cond;   /* Background processing wake up signal */
      |     ^~~~~~~~
/home/danielhb/work/qemu/hw/riscv/riscv-iommu.h:71:18: error: field ‘trap_as’ has incomplete type
   71 |     AddressSpace trap_as;
      |                  ^~~~~~~
/home/danielhb/work/qemu/hw/riscv/riscv-iommu.h:72:18: error: field ‘trap_mr’ has incomplete type
   72 |     MemoryRegion trap_mr;
      |                  ^~~~~~~
/home/danielhb/work/qemu/hw/riscv/riscv-iommu.h:80:18: error: field ‘regs_mr’ has incomplete type
   80 |     MemoryRegion regs_mr;
      |                  ^~~~~~~

Fix it by adding the missing headers for these definitions.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250224190826.1858473-2-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

hw/riscv/riscv-iommu.h

@@ -20,6 +20,8 @@
 #define HW_RISCV_IOMMU_STATE_H
 
 #include "qom/object.h"
+#include "hw/qdev-properties.h"
+#include "system/dma.h"
 #include "hw/riscv/iommu.h"
 #include "hw/riscv/riscv-iommu-bits.h"