arm: Remove stray references to dev/sound/chip.h

Fixes: 923e0040a59a ("sound: Move chip.h contents to pcm/sound.h")
Reported by: Jenkins CI
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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/

Remove pcm_devclass from DRIVER_MODULE invocations.

imx6_ssi: Remove unused variables, #if 0 variables only used under #if 0.

arm: clean up empty lines in .c and .h files

[iMX6] Fix build for SSI driver and add dependency for SDMA driver

- Pass correct pointer to OF_getencprop
- Check the size of "dmas" property
- Add dependency on sdma driver

Reviewed by: br
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D8873

Use the correct OF_getencprop over OF_getprop + fdt32_to_cpu to read
integer data from the device tree.

Sponsored by: ABT Systems Ltd

Stop including fdt_common.h from the arm code when it's unneeded.

Sponsored by: ABT Systems Ltd

sys/arm: Minor spelling fixes.

Only affects comments: no functional change.

Cleanup unnecessary semicolons from the kernel.

Found with devel/coccinelle.

Stop using machine/fdt.h in the arm kernel code when we don't need it.

Add support for audio transmitting, include drivers for:
o Digital Audio Multiplexer (AUDMUX)
o Smart Direct Memory Access Controller (SDMA)
o Synchronous Serial Interface (SSI)

Disable by default as it depends on SDMA firmware.

Sponsored by: Machdep, Inc.