grub-efi-efi-secure-boot.inc: let EFI_BOOT_PATH be overrided

Let the EFI_BOOT_PATH Bitbake variable be overrided if needed.

Signed-off-by: Sandra Tobajas <sandra.tobajas@savoirfairelinux.com>

meta-efi-secure-boot/recipes-bsp/grub/grub-efi-efi-secure-boot.inc

@@ -35,7 +35,7 @@ SRC_URI += "\
 # functions efi_call_foo and efi_shim_exit are not implemented for arm64 yet
 COMPATIBLE_HOST_aarch64 = 'null'
 
-EFI_BOOT_PATH = "/boot/efi/EFI/BOOT"
+EFI_BOOT_PATH ?= "/boot/efi/EFI/BOOT"
 
 GRUB_SECURE_BOOT_MODULES += "${@'efivar password_pbkdf2 ' if d.getVar('UEFI_SB', True) == '1' else ''}"
 
@@ -186,7 +186,7 @@ do_deploy_class-target() {
     cp -af "${D}${EFI_BOOT_PATH}/${GRUB_TARGET}-efi" "${DEPLOYDIR}/efi-unsigned"
 }
 
-FILES_${PN} += "/boot/efi"
+FILES_${PN} += "${EFI_BOOT_PATH}"
 
 CONFFILES_${PN} += "\
     ${EFI_BOOT_PATH}/grub.cfg \