Fix exception vector table alignment.

The vector table needs to be aligned but needs alignment inside the
section for this to translate into alignment in the binary.

Bug: 117551008
Change-Id: I7f837960be76ef37453810cbcaa325427afba0b1
diff --git a/src/arch/aarch64/exceptions.S b/src/arch/aarch64/exceptions.S
index 56f58d9..9fec775 100644
--- a/src/arch/aarch64/exceptions.S
+++ b/src/arch/aarch64/exceptions.S
@@ -1,8 +1,8 @@
 #include "offsets.h"
 
-.balign 0x800
 .section .text.vector_table_el2, "ax"
 .global vector_table_el2
+.balign 0x800
 vector_table_el2:
 	/* sync_cur_sp0 */
 	b .