switch ixp4xx and ubicom32 to 2.6.30, get rid of 2.6.28 files

target/linux/adm5120/patches-2.6.28/001-adm5120.patch

target/linux/adm5120/patches-2.6.28/002-adm5120_flash.patch

target/linux/adm5120/patches-2.6.28/003-adm5120_switch.patch

target/linux/adm5120/patches-2.6.28/005-adm5120_usb.patch

target/linux/adm5120/patches-2.6.28/007-adm5120_pci.patch

...5120/patches-2.6.28/009-adm5120_leds_switch_trigger.patch

...m5120/patches-2.6.28/101-cfi_fixup_macronix_bootloc.patch

.../adm5120/patches-2.6.28/102-jedec_pmc_39lvxxx_chips.patch

target/linux/adm5120/patches-2.6.28/103-mtd_trxsplit.patch

...et/linux/adm5120/patches-2.6.28/120-rb153_cf_driver.patch

...t/linux/adm5120/patches-2.6.28/200-amba_pl010_hacks.patch

target/linux/adm5120/patches-2.6.28/201-amba_bus_hacks.patch

...nux/adm5120/patches-2.6.28/203-gpio_leds_brightness.patch

target/linux/adm5120/patches-2.6.28/310-adm5120_wdt.patch

.../adm5120/patches-2.6.28/801-mtd_trxsplit_2.6.28_fix.patch

target/linux/au1000/patches-2.6.28/001-mtx1_cmdline.patch

target/linux/au1000/patches-2.6.28/002-openwrt_rootfs.patch

...et/linux/au1000/patches-2.6.28/003-au1000_eth_ioctl.patch

...t/linux/au1000/patches-2.6.28/004-state_led_phy_fix.patch

...nux/au1000/patches-2.6.28/006-missing_string_header.patch