arm: actions: rename sysmap-s900 to sysmap-owl

Now that memory maps(for both S700 and S900 SoCs) can be managed using
a common file, rename sysmap-s900 to sysmap-owl to reflect the same.

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>
diff --git a/arch/arm/mach-owl/Makefile b/arch/arm/mach-owl/Makefile
index 0b181c6..f3a69eb 100644
--- a/arch/arm/mach-owl/Makefile
+++ b/arch/arm/mach-owl/Makefile
@@ -1,4 +1,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 
 obj-y += soc.o
-obj-y += sysmap-s900.o
+obj-$(CONFIG_ARM64) += sysmap-owl.o