arm: Make reset position-independent

Some boards, like mx31pdk and tx25, require the beginning of the SPL
code to be position-independent. For these two boards, this is because
they use the i.MX external NAND boot, which starts by executing the
first NAND Flash page from the NFC page buffer. The SPL then needs to
copy itself to its actual link address in order to free the NFC page
buffer and use it to load the non-SPL image from Flash before running
it. This means that the SPL runtime address differs from its link
address between the reset and the initial copy performed by
board_init_f(), so this part of the SPL binary must be
position-independent.

This requirement was broken by commit 41623c9 'arm: move exception
handling out of start.S files', which used an absolute address to branch
to the reset routine. This new commit restores the original behavior,
which just performed a relative branch. This fixes the boot of mx31pdk
and tx25.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
Reported-by: Helmut Raiger <helmut.raiger@hale.at>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Magnus Lilja <lilja.magnus@gmail.com>
Cc: John Rigby <jcrigby@gmail.com>
Tested-by: Magnus Lilja <lilja.magnus@gmail.com>

arch/arm/lib/vectors.S

@@ -50,7 +50,7 @@
 #endif
 
 _start:
-	ldr	pc, _reset
+	b	reset
 	ldr	pc, _undefined_instruction
 	ldr	pc, _software_interrupt
 	ldr	pc, _prefetch_abort
@@ -77,7 +77,6 @@ _start:
 	.globl	_irq
 	.globl	_fiq
 
-_reset:			.word reset
 _undefined_instruction:	.word undefined_instruction
 _software_interrupt:	.word software_interrupt
 _prefetch_abort:	.word prefetch_abort