ARM: imx8m: Do not define do_reset() if sysreset is enabled

The SPL can also be compiled with sysreset drivers just fine, so
update the condition to cater for that option.
Signed-off-by: NMarek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Flavio Suligoi <f.suligoi@asem.it>
Cc: Harald Seiler <hws@denx.de>
Cc: Igor Opaniuk <igor.opaniuk@toradex.com>
Cc: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Cc: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>

arch/arm/mach-imx/imx8m/soc.c

@@ -409,7 +409,7 @@ int ft_system_setup(void *blob, bd_t *bd)
 }
 #endif
 
-#if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_SYSRESET)
+#if !CONFIG_IS_ENABLED(SYSRESET)
 void reset_cpu(ulong addr)
 {
 	struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;