dm: fix compilation issue with gcc10
Fix compilation issue when using gcc 10.x due to the "__packed"
attribute in acpi.h. Explicitly changing that to __attribute__((packed))
fixes the compilation error.
@@ -58,7 +58,7 @@ struct acpi_table_hdr {
char asl_compiler_id[4];
/* ASL compiler version */
uint32_t asl_compiler_revision;
-} __packed;
+} __attribute__((packed));
/* All dynamic table entry no. */
#define NHLT_ENTRY_NO 8
