acpica: Fix build with ACPICA 20230331 and later

ACPICA is using flexible arrays since 20230331 and it broke aarch64
build.

--- acpi_iort.o ---
/usr/src/sys/arm64/acpica/acpi_iort.c:103:4: error: f

acpica: Fix build with ACPICA 20230331 and later

ACPICA is using flexible arrays since 20230331 and it broke aarch64
build.

--- acpi_iort.o ---
/usr/src/sys/arm64/acpica/acpi_iort.c:103:4: error: field 'data' with
variable sized type 'union (unnamed union at
/usr/src/sys/arm64/acpica/acpi_iort.c:98:2)' not at the end of a struct
or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
103 | } data;
| ^

Reported by: bapt
Tested by: bapt

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