imx: ahab: Move imx9 and imx8ulp AHAB support together

Use common file ele_ahab.c for i.MX9 and iMX8ULP AHAB support, since
both of them use same sentinel ELE APIs

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 4dfc60e..9bcb23c 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -77,6 +77,10 @@
 obj-$(CONFIG_SPL_LOAD_IMX_CONTAINER) += image-container.o parse-container.o
 endif
 
+ifeq ($(SOC),$(filter $(SOC),imx8ulp imx9))
+obj-$(CONFIG_AHAB_BOOT) += ele_ahab.o
+endif
+
 PLUGIN = board/$(BOARDDIR)/plugin
 
 ifeq ($(CONFIG_USE_IMXIMG_PLUGIN),y)