convert profiles to become subtargets, compile tested only

target/linux/rdc/Makefile

target/linux/rdc/amit/config-2.6.30

target/linux/rdc/amit/target.mk

target/linux/rdc/ar525w/config-2.6.30

target/linux/rdc/ar525w/target.mk

target/linux/rdc/config/profile-ar525w

target/linux/rdc/config/profile-dir450

target/linux/rdc/config/profile-r8610

target/linux/rdc/dir-450/config-2.6.30

target/linux/rdc/dir-450/target.mk

target/linux/rdc/profiles/AMIT.mk

target/linux/rdc/profiles/AR525W.mk

target/linux/rdc/profiles/DIR-450.mk

target/linux/rdc/profiles/G-570S.mk

target/linux/rdc/profiles/R8610.mk

target/linux/rdc/profiles/WL-153.mk

target/linux/rdc/r8610/config-2.6.30

target/linux/rdc/r8610/target.mk