Correct SPL uses of ZYNQMP_FIRMWARE

This converts 2 usages of this option to the non-SPL form, since there is
no SPL_ZYNQMP_FIRMWARE defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/spi/cadence_ospi_versal.c b/drivers/spi/cadence_ospi_versal.c
index e0d5e6b..434c603 100644
--- a/drivers/spi/cadence_ospi_versal.c
+++ b/drivers/spi/cadence_ospi_versal.c
@@ -216,7 +216,7 @@
 
 void cadence_qspi_apb_enable_linear_mode(bool enable)
 {
-	if (CONFIG_IS_ENABLED(ZYNQMP_FIRMWARE)) {
+	if (IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE)) {
 		if (enable)
 			/* ahb read mode */
 			xilinx_pm_request(PM_IOCTL, PM_DEV_OSPI,