arm: spear: Reference the link register with LR instead of R14

The link register is stored in R14. ARM assembly code allows to use
the 'lr' name to reference it instead of 'r14' which is not very
meaningful. Do the substitution to ease the reading.
Signed-off-by: NMiquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: NStefan Roese <sr@denx.de>

arch/arm/cpu/arm926ejs/spear/start.S

@@ -35,7 +35,7 @@ reset:
 	* SPL has to return back to BootROM in a few cases (eg. Ethernet boot,
 	* UART boot, USB boot): save registers in BootROM's stack.
 	*/
-	push	{r0-r12,r14}
+	push	{r0-r12,lr}
 	bl	cpu_init_crit
 	pop	{r0-r12,pc}