linux: Remove incorrect repr(align(8)) for canxl_frame

`can_frame` and `canfd_frame` need this, but `canxl_frame` does not.
This was causing the struct to be incorrectly aligned.

(backport <#4760>)
(cherry picked from commit 488022e)

Author: tgross35

src/new/linux_uapi/linux/can.rs

@@ -72,7 +72,6 @@ pub const CANXL_XLF: c_int = 0x80;
 pub const CANXL_SEC: c_int = 0x01;
 
 s! {
-    #[repr(align(8))]
     pub struct canxl_frame {
         pub prio: canid_t,
         pub flags: u8,