Ongoing work for adding per-thread UTCB structures.

Added setting of utcb address to l4_thread_control.
This is going to be moved to exchange_registers() since we need to pass
both the utcb physical and virtual address and exregs fits such context
modification better than thread_control.

tasks/test0/include/linker.lds

@@ -30,10 +30,9 @@ SECTIONS
 	/* rodata is needed else your strings will link at physical! */
 	.rodata : AT (ADDR(.rodata) - offset) { *(.rodata) }
 	.rodata1 : AT (ADDR(.rodata1) - offset) { *(.rodata1) }
-
-	. = ALIGN(4K);
 	.data : AT (ADDR(.data) - offset)
 	{
+		. = ALIGN(4K);
 		_start_test1 = .;
 		*(.test1)
 		_end_test1 = .;