Convert CONFIG_ZYNQMP_PSU_INIT_ENABLED to Kconfig

This converts the following to Kconfig:
   CONFIG_ZYNQMP_PSU_INIT_ENABLED

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/xilinx_zynqmp_mini_emmc0_defconfig b/configs/xilinx_zynqmp_mini_emmc0_defconfig
index d4a8517..08e90f6 100644
--- a/configs/xilinx_zynqmp_mini_emmc0_defconfig
+++ b/configs/xilinx_zynqmp_mini_emmc0_defconfig
@@ -10,6 +10,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="zynqmp-mini-emmc0"
 CONFIG_SPL_SYS_MALLOC_F_LEN=0x600
 CONFIG_SPL=y
+CONFIG_ZYNQMP_PSU_INIT_ENABLED=y
 # CONFIG_CMD_ZYNQMP is not set
 CONFIG_SYS_LOAD_ADDR=0x8000000
 CONFIG_FIT=y