qemu-arm: Drop ARCH_SUPPORT_TFABOOT

CONFIG_ARCH_SUPPORT_TFABOOT was used on the qemu-arm64 platform to
guard a tweak to the flash bank configuration. U-Boot now reads the
current flash setup from the devicetree, so there is no need for
this option anymore.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b81d80c..0ecd0c6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -932,7 +932,6 @@
 
 config ARCH_QEMU
 	bool "QEMU Virtual Platform"
-	select ARCH_SUPPORT_TFABOOT
 	select DM
 	select DM_SERIAL
 	select OF_CONTROL