samples: net: zperf: Enable i226 config with Intel Alderlake

The Zperf sample application was chosen to demonstrate basic network
functionality and high-performance use cases. This application serves
as a reference for users who wish to enable other network sample
applications.

In addition to the essential configurations for the Intel i226 Ethernet
controller, stack-specific configurations were added to ensure stability
under heavy network loads. These configurations include adjustments to
buffer sizes, interrupt handling, and DMA descriptor management.

Signed-off-by: Vijayakannan Ayyathurai <vijayakannan.ayyathurai@intel.com>

Author: Vijayakannan

samples/net/zperf/boards/intel_adl_crb.conf

@@ -0,0 +1,35 @@
+#
+# Ethernet Drivers
+#
+CONFIG_ETH_INTEL_PLAT=y
+CONFIG_ETH_INTEL_IGC=y
+
+#
+# Link layer options
+#
+CONFIG_NET_L2_ETHERNET=y
+
+CONFIG_NET_PKT_RX_COUNT=512
+CONFIG_NET_PKT_TX_COUNT=512
+CONFIG_NET_BUF_RX_COUNT=512
+CONFIG_NET_BUF_TX_COUNT=512
+CONFIG_NET_BUF_DATA_SIZE=1024
+
+#
+# Increase stack usage for stability
+#
+CONFIG_NET_TX_STACK_SIZE=8192
+CONFIG_NET_RX_STACK_SIZE=8192
+CONFIG_NET_TCP_WORKQ_STACK_SIZE=8192
+CONFIG_NET_MGMT_EVENT_STACK_SIZE=8192
+CONFIG_NET_SOCKETS_SERVICE=y
+CONFIG_NET_SOCKETS_SERVICE_STACK_SIZE=8192
+
+#
+# IP stack
+#
+CONFIG_NET_IPV4_FRAGMENT=y
+CONFIG_NET_STATISTICS_ETHERNET=n
+
+# Disable VTD_ICTL until have IOMMU support.
+CONFIG_INTEL_VTD_ICTL=n