sysreset: enable driver support in SPL/TPL

SPL/TPL also need use sysreset for some feature like panic callback.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a3d67e4..3c4af1f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1436,6 +1436,7 @@
 	select SYSCON
 	select SYSRESET
 	select SYS_THUMB_BUILD
+	imply SPL_SYSRESET
 	imply CMD_DM
 	imply CMD_POWEROFF
 	imply ENV_VARS_UBOOT_RUNTIME_CONFIG