package/gnu-efi: fix legal-info

Fix a bunch of deficiencies:
  - 'debian/copyright' does not exist.
  - gnuefi is not GPLv2+. Only one AArch64 file has GPLv2+ headers,
    all others have BSD-3c
  - efilib is BSD-2c

Change the licensing information to include BSD-3c for the gnuefi parts,
and keep refernce to GPLv2+ as the Main README.gnuefi references it.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gnu-efi/gnu-efi.mk

@@ -8,8 +8,8 @@ GNU_EFI_VERSION = 3.0.1
 GNU_EFI_SOURCE = gnu-efi-$(GNU_EFI_VERSION).tar.bz2
 GNU_EFI_SITE = http://downloads.sourceforge.net/project/gnu-efi
 GNU_EFI_INSTALL_STAGING = YES
-GNU_EFI_LICENSE = GPLv2+ (gnuefi), BSD (efilib)
-GNU_EFI_LICENSE_FILES = debian/copyright
+GNU_EFI_LICENSE = BSD-3c and/or GPLv2+ (gnuefi), BSD-3c (efilib)
+GNU_EFI_LICENSE_FILES = README.efilib
 
 # gnu-efi is a set of library and header files used to build
 # standalone EFI applications such as bootloaders. There is no point