Add support for Mikrotik RB5009

Device support is based on the patch set linked in the OpenWrt Wiki. [1][2]

The aux-loader blob is not included, as it is only required for initial
installation.

Two additional kernel patches for mvpp2 are added to allow receive
hashing to work properly in the DSA setup of the device.

[1] https://openwrt.org/toh/mikrotik/rb5009ug_s_in#installation
[2] https://paste.myconan.net/482114

Signed-off-by: Fabian Bläse <fabian@blaese.de>

bsp/mvebu-cortexa72/.config

@@ -31,6 +31,7 @@ CONFIG_CLEAN_IPKG=y
 # CONFIG_FASTD_ENABLE_METHOD_GENERIC_GMAC is not set
 # CONFIG_FASTD_ENABLE_METHOD_GENERIC_UMAC is not set
 # CONFIG_PACKAGE_ALFRED_VIS is not set
+CONFIG_PACKAGE_fff-extra=y
 CONFIG_PACKAGE_libuclient=m
 CONFIG_PACKAGE_libwolfssl=m
 CONFIG_PACKAGE_opkg=m