commonlib/coreboot_tables.h: Don't pack structs

Packing structs will result in unaligned sizes, possible causing
problems for other entries.

Change-Id: Ifb756ab4e3562512e1160224678a6de23f3b84ec
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63714
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/commonlib/include/commonlib/coreboot_tables.h

@@ -552,7 +552,7 @@ struct lb_tpm_physical_presence {
 	uint32_t ppi_address;	/* Address of ACPI PPI communication buffer */
 	uint8_t tpm_version;	/* 1: TPM1.2, 2: TPM2.0 */
 	uint8_t ppi_version;	/* BCD encoded */
-} __packed;
+};
 
 
 /*