kexec_elf: remove PURGATORY_STACK_SIZE

It's not used anywhere so just drop it.
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Helge Deller <deller@gmx.de>

kernel/kexec_elf.c

@@ -21,8 +21,6 @@
 #include <linux/slab.h>
 #include <linux/types.h>
 
-#define PURGATORY_STACK_SIZE	(16 * 1024)
-
 #define elf_addr_to_cpu	elf64_to_cpu
 
 #ifndef Elf_Rel