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/board/qca/ap152/Kconfig b/board/qca/ap152/Kconfig
new file mode 100644
index 0000000..f6ad498
--- /dev/null
+++ b/board/qca/ap152/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_AP152
+
+config SYS_VENDOR
+	default "qca"
+
+config SYS_BOARD
+	default "ap152"
+
+config SYS_CONFIG_NAME
+	default "ap152"
+
+config SYS_TEXT_BASE
+	default 0x9f000000
+
+endif