ralink: drop 3.14 support

target/linux/ramips/mt7620/config-3.14

target/linux/ramips/mt7621/config-3.14

target/linux/ramips/mt7628/config-3.14

.../patches-3.14/0001-MIPS-ralink-add-verbose-pmu-info.patch

...IPS-ralink-add-a-helper-for-reading-the-ECO-version.patch

...atches-3.14/0003-MIPS-ralink-add-rt_sysc_m32-helper.patch

...-3.14/0004-MIPS-ralink-adds-a-bootrom-dumper-module.patch

...hes-3.14/0005-MIPS-ralink-add-illegal-access-driver.patch

.../0006-MIPS-ralink-add-missing-clk_set_rate-to-clk.c.patch

...tches-3.14/0007-MIPS-ralink-add-support-for-MT7620n.patch

...-3.14/0008-MIPS-ralink-allow-manual-memory-override.patch

...14/0009-MIPS-ralink-define-the-wmac-clock-on-mt7620.patch

...14/0010-MIPS-ralink-define-the-wmac-clock-on-rt3883.patch

...patches-3.14/0011-MIPS-ralink-add-rt2880-wmac-clock.patch

...ps/patches-3.14/0012-MIPS-ralink-add-MT7621-support.patch

.../patches-3.14/0013-MIPS-ralink-add-MT7621-defconfig.patch

...s/patches-3.14/0014-MIPS-ralink-add-MT7621-dts-file.patch

.../patches-3.14/0015-MIPS-ralink-cleanup-early_printk.patch

...atches-3.14/0016-MIPS-ralink-add-MT7621-pcie-driver.patch

...IPS-use-set_mode-to-enable-disable-the-cevt-r4k-irq.patch