include: env: phytec: Add optargs to K3 files

Add the optargs variable so that we can set optional arguments while
booting.

Signed-off-by: Nathan Morrisson <nmorrisson@phytec.com>
Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
diff --git a/include/env/phytec/k3_spi.env b/include/env/phytec/k3_spi.env
index 97d3a15..8e9cfce 100644
--- a/include/env/phytec/k3_spi.env
+++ b/include/env/phytec/k3_spi.env
@@ -6,7 +6,7 @@
 
 /* Logic for TI K3 based SoCs to boot from an OSPI/QSPI NOR flash. */
 
-spiargs=setenv bootargs console=${console} earlycon=${earlycon}
+spiargs=setenv bootargs console=${console} earlycon=${earlycon} ${optargs}
 spiloadimage=sf read ${kernel_addr_r} ${spi_image_addr} ${size_kern}
 spiloadfdt=sf read ${fdt_addr_r} ${spi_fdt_addr} ${size_fdt}
 spiloadramdisk=sf read ${ramdisk_addr_r} ${spi_ramdisk_addr} ${size_fs}