drivers: wifi: nrfwifi: Enable variable network configurations

Add variable network configuration control into the driver to optimize
RAM usage by default. The pool sizes are default, and tuning is left to
the applications or samples.

Signed-off-by: Triveni Danda <[email protected]>

Author: D-Triveni

drivers/wifi/nrf_wifi/Kconfig.nrfwifi

@@ -561,6 +561,12 @@ config NET_TC_TX_COUNT
 
 endif # NETWORKING
 
+# nRF70 now uses variable buffers as default to optimize RAM usage. Default pool sizes are used, samples/apps can override
+# for higher performance.
+choice NET_PKT_DATA_ALLOC_TYPE
+	default NET_BUF_VARIABLE_DATA_SIZE
+endchoice
+
 config MAIN_STACK_SIZE
 	default 4096