arm: zynq: Rework FPGA initialization

This commit moves the FPGA descriptor definition
to mach-zynq, where it makes more sense.

Based on patches from Ariel D'Alessandro <ariel@vanguardiasur.com.ar>
and Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/zynq_cse_qspi_defconfig b/configs/zynq_cse_qspi_defconfig
index 9d4c79f..88049d2 100644
--- a/configs/zynq_cse_qspi_defconfig
+++ b/configs/zynq_cse_qspi_defconfig
@@ -12,6 +12,7 @@
 CONFIG_BOOTDELAY=-1
 # CONFIG_USE_BOOTCOMMAND is not set
 # CONFIG_DISPLAY_CPUINFO is not set
+# CONFIG_ARCH_EARLY_INIT_R is not set
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_SPI_LOAD=y
 CONFIG_SYS_PROMPT="Zynq> "