drop 3.19 support

include/kernel-version.mk

target/linux/generic/config-3.19

.../generic/patches-3.19/000-keep_initrafs_the_default.patch

target/linux/generic/patches-3.19/020-bcma-from-4.0.patch

target/linux/generic/patches-3.19/021-bcma-from-4.1.patch

...-3.19/030-nl80211-Allow-set-network-namespace-by-fd.patch

...generic/patches-3.19/050-backport_netfilter_rtcache.patch

.../generic/patches-3.19/060-mips_decompressor_memmove.patch

...gmac-fix-device-initialization-on-Northstar-SoCs-co.patch

...neric/patches-3.19/071-bgmac-Clean-warning-messages.patch

...gmac-register-fixed-PHY-for-ARM-BCM470X-BCM5301X-ch.patch

...hes-3.19/073-bgmac-allow-enabling-on-ARCH_BCM_5301X.patch

...t/linux/generic/patches-3.19/102-ehci_hcd_ignore_oc.patch

...s-3.19/120-bridge_allow_receiption_on_disabled_port.patch

.../linux/generic/patches-3.19/132-mips_inline_dma_ops.patch

target/linux/generic/patches-3.19/200-fix_localversion.patch

...t/linux/generic/patches-3.19/201-extra_optimization.patch

...t/linux/generic/patches-3.19/202-reduce_module_size.patch

...inux/generic/patches-3.19/203-kallsyms_uncompressed.patch

target/linux/generic/patches-3.19/204-module_strip.patch