boot/uboot: pass -mno-fdpic if FDPIC is enabled

If the FDPIC ABI is enabled by default in the toolchain, it must be
explicitly disabled when building U-Boot.

Signed-off-by: Ben Wolsieffer <Ben.Wolsieffer@hefring.com>
Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

boot/uboot/uboot.mk

@@ -172,6 +172,11 @@ UBOOT_MAKE_OPTS += \
 	HOSTLDFLAGS="$(HOST_LDFLAGS)" \
 	$(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_MAKEOPTS))
 
+# Disable FDPIC if enabled by default in toolchain
+ifeq ($(BR2_BINFMT_FDPIC),y)
+UBOOT_MAKE_OPTS += KCFLAGS=-mno-fdpic
+endif
+
 ifeq ($(BR2_TARGET_UBOOT_NEEDS_ATF_BL31),y)
 UBOOT_DEPENDENCIES += arm-trusted-firmware
 ifeq ($(BR2_TARGET_UBOOT_NEEDS_ATF_BL31_ELF),y)