MIPS: ath25: Add basic AR2315 SoC support

Add basic support for Atheros AR2315+ SoCs: registers definition file
and initial setup code.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8239/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/ath25/Makefile b/arch/mips/ath25/Makefile
index 3361619..201b7d4 100644
--- a/arch/mips/ath25/Makefile
+++ b/arch/mips/ath25/Makefile
@@ -11,3 +11,4 @@
 obj-y += board.o prom.o devices.o
 
 obj-$(CONFIG_SOC_AR5312) += ar5312.o
+obj-$(CONFIG_SOC_AR2315) += ar2315.o