config: Add Dell Latitude E5520

...patches/0035-mb-dell-Add-Latitude-E5520-Sandybridge.patch

config/coreboot/dell9020mt_12mb/config/libgfxinit_corebootfb

config/coreboot/dell9020mt_12mb/config/libgfxinit_txtmode

config/coreboot/e5520_6mb/config/libgfxinit_corebootfb

config/coreboot/e5520_6mb/config/libgfxinit_txtmode

config/coreboot/e5520_6mb/target.cfg

config/coreboot/e5530_12mb/config/libgfxinit_corebootfb

config/coreboot/e5530_12mb/config/libgfxinit_txtmode

config/coreboot/e6420_10mb/config/libgfxinit_corebootfb

config/coreboot/e6420_10mb/config/libgfxinit_txtmode

config/coreboot/e6430_12mb/config/libgfxinit_corebootfb

config/coreboot/e6430_12mb/config/libgfxinit_txtmode

config/coreboot/e6520_10mb/config/libgfxinit_corebootfb

config/coreboot/e6520_10mb/config/libgfxinit_txtmode

config/coreboot/e6530_12mb/config/libgfxinit_corebootfb

config/coreboot/e6530_12mb/config/libgfxinit_txtmode

config/coreboot/t1650_12mb/config/libgfxinit_txtmode

config/ifd/dell_sandybridge/6_ifd_nogbe

config/vendor/sources