ARM: zynq: Do not select options if SPL is not enabled

Zynq setups some default options for SPL but not all targets are
enabling SPL.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/Kconfig

@@ -558,15 +558,15 @@ config ARCH_ZYNQ
 	select CPU_V7
 	select SUPPORT_SPL
 	select OF_CONTROL
-	select SPL_OF_CONTROL
+	select SPL_OF_CONTROL if SPL
 	select DM
 	select DM_ETH
-	select SPL_DM
+	select SPL_DM if SPL
 	select DM_MMC
 	select DM_SPI
 	select DM_SERIAL
 	select DM_SPI_FLASH
-	select SPL_SEPARATE_BSS
+	select SPL_SEPARATE_BSS if SPL
 
 config ARCH_ZYNQMP
 	bool "Support Xilinx ZynqMP Platform"