boot/arm-trusted-firmware: enable verbose output

Signed-off-by: Brandon Maier <brandon.maier@collins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit a8c7a53985a62fd8a25cbe803628c64527da21fc)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

boot/arm-trusted-firmware/arm-trusted-firmware.mk

@@ -59,6 +59,7 @@ endif
 endif
 
 ARM_TRUSTED_FIRMWARE_MAKE_OPTS += \
+	$(if $(VERBOSE),V=1) \
 	CROSS_COMPILE="$(TARGET_CROSS)" \
 	BUILD_STRING=$(ARM_TRUSTED_FIRMWARE_VERSION) \
 	$(call qstrip,$(BR2_TARGET_ARM_TRUSTED_FIRMWARE_ADDITIONAL_VARIABLES)) \