Remove 2.6.23 files, we will stick to 2.6.24 for rdc

target/linux/rdc/config-2.6.23

target/linux/rdc/patches-2.6.23/001-rdc3210_flash_map.patch

target/linux/rdc/patches-2.6.23/001-x86_generic_gpio.patch

target/linux/rdc/patches-2.6.23/002-r6040_ethernet.patch

target/linux/rdc/patches-2.6.23/003-rootfstype.patch

target/linux/rdc/patches-2.6.23/004-rdc_fixes.patch

target/linux/rdc/patches-2.6.23/005-rdc_x86_cpu_type.patch

target/linux/rdc/patches-2.6.23/006-pci_ids.patch

target/linux/rdc/patches-2.6.23/600-x86_lzma.patch