xtensa: the size of the elf_gregset_t array is actually 128.

Signed-off-by: Chris Zankel <chris@zankel.net>

libc/sysdeps/linux/xtensa/sys/procfs.h

@@ -38,7 +38,7 @@ __BEGIN_DECLS
 /* Type for a general-purpose register.  */
 typedef unsigned long elf_greg_t;
 
-#define ELF_NGREG 32
+#define ELF_NGREG 128
 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 
 /* Register set for the floating-point registers.  */