drivers: wifi: siwx91x: To improve SiWx91x performance

To enhance throughput performance on the SiWx91x series, Added
some Siwx91x configurations by deafult.

Signed-off-by: Rahul Gurram <[email protected]>

Author: ragurram26

dts/arm/silabs/siwg917.dtsi

@@ -64,7 +64,7 @@
 		 * Less memory is allocated to Zephyr, more memory is allocated
 		 * to NWP, better are the WiFi and BLE performances.
 		 */
-		reg = <0x00000400 DT_SIZE_K(255)>;
+		reg = <0x00000400 DT_SIZE_K(319)>;
 	};
 
 	sram_dma1: memory-dma@24061c00 {

soc/silabs/silabs_siwx91x/siwg917/siwx91x_nwp.c

@@ -330,6 +330,11 @@ static int siwx91x_get_nwp_config(const struct device *dev,
 				SL_SI91X_EXT_FEAT_FRONT_END_SWITCH_PINS_ULP_GPIO_4_5_0 |
 				SL_SI91X_EXT_FEAT_FRONT_END_INTERNAL_SWITCH |
 				SL_SI91X_EXT_FEAT_XTAL_CLK,
+		},
+		.ta_pool = {
+			.tx_ratio_in_buffer_pool     = 1,
+			.rx_ratio_in_buffer_pool     = 1,
+			.global_ratio_in_buffer_pool = 1
 		}
 	};