mips: add initial support for qca956x referenced board

QCA9563 is CPU used on AP152 board :

    Clock speed : 750 MHz ,
    Arch :  Mips 74Kc,
    Eth : SGMII interface,
    MIMO config : 3 * 3 450M,
    2 * USB 2.0,

Signed-off-by: Rosy Song <rosysong@rosinson.com>

Changes for v2:
   - coding style cleanup
   - remove ununsed flash chip in defconfig
   - enable automatic icache / dcache size in defconfig

Changes for v3:
   - add detailed information for qca956x in commit message

Changes for v4:
   - remove pre-configured network settings in ap152.h

Changes for v5:
   - coding style cleanup
diff --git a/arch/mips/dts/Makefile b/arch/mips/dts/Makefile
index 665d3cc..3522e6c 100644
--- a/arch/mips/dts/Makefile
+++ b/arch/mips/dts/Makefile
@@ -5,6 +5,7 @@
 	linkit-smart-7688.dtb
 dtb-$(CONFIG_TARGET_AP121) += ap121.dtb
 dtb-$(CONFIG_TARGET_AP143) += ap143.dtb
+dtb-$(CONFIG_TARGET_AP152) += ap152.dtb
 dtb-$(CONFIG_TARGET_BOSTON) += img,boston.dtb
 dtb-$(CONFIG_TARGET_MALTA) += mti,malta.dtb
 dtb-$(CONFIG_TARGET_PIC32MZDASK) += pic32mzda_sk.dtb