sys: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

arm64: Clean up smmu fdt xref handling

Use the xref from OF_xref_from_node for the smmu xref. We already have
a valid xref ID, there is no need to convert this to a memory address.

Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D39181

smmu: fix FDT and !FDT builds.

Reviewed by: andrew
Sponsored by: UKRI
Differential Revision: https://reviews.freebsd.org/D37762

Add OFW support to arm64's IOMMU framework.
This is needed to support non-PCI devices like memory-mapped
display controllers.
Split-out some initialization code from iommu_ctx_alloc() into
iommu_ctx_init() method so we could pass controller's MD-data
obtained from DTS to the driver prior to a CTX initialization.

Tested on Morello SoC.

Sponsored by: UKRI

Allocate resources selectively.
One of the SMMU interrupt lines (priq) is optional and may be ommited in FDT.

Tested on ARM Morello Board, which has three SMMU units: first two have four
interrupt lines, last one has three interrupt lines.

Sponsored by: UKRI

Add FDT attachment driver for ARM System MMU v3.2 controller.

Tested on ARM Morello Board.

Sponsored by: UKRI