ec/google/chromeec: Add packed attribute to structs in union

Clang warns about structs inside a union also needing the packed
attribute.

This files is copied from the chromeec project, so it adds comment next
to the coreboot specific changes as a reference.

TEST: google/vilboz remains the same with BUILD_TIMELESS=1 and gcc.

Change-Id: I8b5233618081db86caedcb2d14870974e109ed9b
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69742
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

src/ec/google/chromeec/ec_commands.h

@@ -4636,12 +4636,12 @@ struct ec_params_charge_state {
 
 		struct __ec_todo_unpacked {
 			uint32_t param;		/* enum charge_state_param */
-		} get_param;
+		} __ec_todo_packed get_param; /* coreboot change */
 
 		struct __ec_todo_unpacked {
 			uint32_t param;		/* param to set */
 			uint32_t value;		/* value to set */
-		} set_param;
+		} __ec_todo_packed set_param; /* coreboot change */
 	};
 	uint8_t chgnum;				/* Version 1 supports chgnum */
 } __ec_todo_packed;