configs/aarch64_efi: needs host-{dosfstools, mtools}

Fixes:
    https://gitlab.com/ymorin/buildroot/-/jobs/131924126

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Erico Nunes <nunes.erico@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Reviewed-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/aarch64_efi_defconfig

@@ -32,3 +32,7 @@ BR2_LINUX_KERNEL_CUSTOM_VERSION=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.18.10"
 BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
 BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+
+# Host tools for genimage
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_MTOOLS=y