boot/uboot: add BR2_TARGET_UBOOT_NEEDS_GNUTLS option

Since U-Boot 2022.04 a host dependency to gnutls is required if the
U-Boot board configuration has CONFIG_TOOLS_MKEFICAPSULE enabled. So
introduce a new BR U-Boot config option BR2_TARGET_UBOOT_NEEDS_GNUTLS
to solve this problem.

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

boot/uboot/Config.in

@@ -182,6 +182,14 @@ config BR2_TARGET_UBOOT_NEEDS_LZOP
 	  the case when the board configuration has CONFIG_SPL_LZO
 	  enabled.
 
+config BR2_TARGET_UBOOT_NEEDS_GNUTLS
+	bool "U-Boot needs gnutls"
+	help
+	  Select this option if your U-Boot board configuration
+	  requires gnutls to be available on the host. This is
+	  typically the case when the board configuration has
+	  CONFIG_TOOLS_MKEFICAPSULE enabled.
+
 config BR2_TARGET_UBOOT_NEEDS_ATF_BL31
 	bool "U-Boot needs ATF BL31"
 	depends on BR2_TARGET_ARM_TRUSTED_FIRMWARE

boot/uboot/uboot.mk

@@ -227,6 +227,10 @@ ifeq ($(BR2_TARGET_UBOOT_NEEDS_LZOP),y)
 UBOOT_DEPENDENCIES += host-lzop
 endif
 
+ifeq ($(BR2_TARGET_UBOOT_NEEDS_GNUTLS),y)
+UBOOT_DEPENDENCIES += host-gnutls
+endif
+
 # prior to u-boot 2013.10 the license info was in COPYING. Copy it so
 # legal-info finds it
 define UBOOT_COPY_OLD_LICENSE_FILE