ivt: move undef_stack into .data section

Signed-off-by: Levente Kurusa <levex@linux.com>

Author: levex

arch/ivt.S

@@ -17,11 +17,12 @@ fault_irq_str: .asciz "IRQ fault happened\n"
 .balign 16
 fault_fiq_str: .asciz "FIQ fault happened\n"
 
-.section ".text"
-
 .balign 4
 undef_stack: .skip 4 * 32
 
+.section ".text"
+
+
 .balign 16
 fault_reset:
     ldr r0, =fault_reset_str