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_virt_defconfig b/configs/xilinx_zynqmp_virt_defconfig
index dc84589..86223cd 100644
--- a/configs/xilinx_zynqmp_virt_defconfig
+++ b/configs/xilinx_zynqmp_virt_defconfig
@@ -18,6 +18,7 @@
 CONFIG_ZYNQ_GEM_I2C_MAC_OFFSET=0x20
 CONFIG_CMD_FRU=y
 CONFIG_ZYNQMP_USB=y
+CONFIG_ZYNQMP_PSU_INIT_ENABLED=y
 CONFIG_AHCI=y
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_SYS_LOAD_ADDR=0x8000000