ramips: convert the remaining subtargets to 4.4

target/linux/ramips/Makefile

target/linux/ramips/mt7620/config-4.4

target/linux/ramips/mt7628/config-4.4

target/linux/ramips/mt7688/config-4.4

...atches-4.3/0001-arch-mips-ralink-add-mt7621-support.patch

...s/patches-4.3/0002-MIPS-ralink-add-MT7621-defconfig.patch

...s/patches-4.3/0003-MIPS-ralink-cleanup-early_printk.patch

...patches-4.3/0004-MIPS-ralink-add-MT7621-pcie-driver.patch

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

...ches-4.3/0006-MIPS-ralink-add-cpu-frequency-scaling.patch

...IPS-ralink-copy-the-commandline-from-the-devicetree.patch

...IPS-ralink-mt7620-fix-usb-issue-during-frequency-sc.patch

.../patches-4.3/0009-PCI-MIPS-adds-mt7620a-pcie-driver.patch

...s/patches-4.3/0010-arch-mips-ralink-add-spi1-clocks.patch

...tches-4.3/0011-arch-mips-ralink-unify-soc-detection.patch

.../ramips/patches-4.3/0012-arch-mips-fix-clock-jitter.patch

...s/patches-4.3/0013-owrt-hack-fix-mt7688-cache-issue.patch

...mips/patches-4.3/0014-arch-mips-cleanup-cevt-rt3352.patch

...rch-mips-do-not-select-illegal-access-driver-by-def.patch

...ches-4.3/0016-arch-mips-ralink-remove-non-PCI-check.patch