drivers: nrf_wifi: Add a config option for variable bufs override

We need a way to disable the variable buffers override.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

Author: krish2718

drivers/wifi/nrf_wifi/Kconfig.nrfwifi

@@ -551,11 +551,22 @@ config NET_TC_TX_COUNT
 
 endif # NETWORKING
 
+config NRF_WIFI_USE_VARIABLE_NET_BUFS
+	bool "Use variable network buffers"
+	default y
+	help
+	  This option enables the use of variable network buffers in the nRF70 driver.
+	  Variable network buffers optimize RAM usage by allocating buffers of different sizes
+	  based on the data size. This option is enabled by default to optimize RAM usage.
+	  Samples and applications can override this option for higher performance.
+
+if NRF_WIFI_USE_VARIABLE_NET_BUFS
 # 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
+endif # NRF_WIFI_USE_VARIABLE_NET_BUFS
 
 config MAIN_STACK_SIZE
 	default 4096