MIPS: IncaIP: Move all IncaIP specific code to separate subdirectory

IncaIP is a SoC and its specific code should reside in an own
SoC subdirectory. Also add -mtune=4kc flag for CPU optimization.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
Cc: Wolfgang Denk <wd@denx.de>
Signed-off-by: Shinya Kuribayashi <skuribay@pobox.com>
diff --git a/boards.cfg b/boards.cfg
index 8194bb2..7844bbd 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -223,10 +223,10 @@
 dbau1550                     mips        mips32      dbau1x00            -              -           dbau1x00:DBAU1550
 dbau1550_el                  mips        mips32      dbau1x00            -              -           dbau1x00:DBAU1550
 gth2                         mips        mips32
-incaip                       mips        mips32
-incaip_100MHz                mips        mips32      incaip              -              -           incaip:CPU_CLOCK_RATE=100000000
-incaip_133MHz                mips        mips32      incaip              -              -           incaip:CPU_CLOCK_RATE=133000000
-incaip_150MHz                mips        mips32      incaip              -              -           incaip:CPU_CLOCK_RATE=150000000
+incaip                       mips        mips32      incaip              -              incaip
+incaip_100MHz                mips        mips32      incaip              -              incaip      incaip:CPU_CLOCK_RATE=100000000
+incaip_133MHz                mips        mips32      incaip              -              incaip      incaip:CPU_CLOCK_RATE=133000000
+incaip_150MHz                mips        mips32      incaip              -              incaip      incaip:CPU_CLOCK_RATE=150000000
 pb1000                       mips        mips32      pb1x00              -              -           pb1x00:PB1000
 qemu_mips                    mips        mips32      qemu-mips           -              -           qemu-mips
 tb0229                       mips        mips32