xen/arm: remove unused defines in <asm/bug.h>

The following defines BUG_DISP_WIDTH, BUG_LINE_LO_WIDTH,
BUG_LINE_HI_WIDTH aren't used in ARM so could be purged
as unused.

Requested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>

xen/arch/arm/include/asm/bug.h

@@ -9,10 +9,6 @@
 # error "unknown ARM variant"
 #endif
 
-#define BUG_DISP_WIDTH    24
-#define BUG_LINE_LO_WIDTH (31 - BUG_DISP_WIDTH)
-#define BUG_LINE_HI_WIDTH (31 - BUG_DISP_WIDTH)
-
 struct bug_frame {
     signed int loc_disp;    /* Relative address to the bug address */
     signed int file_disp;   /* Relative address to the filename */