arm: dts: sync dts for Action Semi S900

Synchronize device tree bindings with v5.5-rc6 tag with commit id
"b3a987b0264d".

Also, it removes older clock binding defined for S900 along with undocumented
compatible string "actions,s900-serial" from serial driver and adapts clock
driver to cater to new bindings.

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 59a2713..ba96efa 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -64,7 +64,7 @@
 	kirkwood-pogo_e02.dtb \
 	kirkwood-sheevaplug.dtb
 
-dtb-$(CONFIG_ARCH_OWL) += \
+dtb-$(CONFIG_MACH_S900) += \
 	bubblegum_96.dtb
 
 dtb-$(CONFIG_ROCKCHIP_PX30) += \