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

@@ -322,7 +322,8 @@ static int siwx91x_get_nwp_config(const struct device *dev,
 			.tcp_ip_feature_bit_map = SL_SI91X_TCP_IP_FEAT_EXTENSION_VALID,
 			.custom_feature_bit_map = SL_SI91X_CUSTOM_FEAT_EXTENSION_VALID |
 						  SL_SI91X_CUSTOM_FEAT_ASYNC_CONNECTION_STATUS |
-						  SL_SI91X_CUSTOM_FEAT_RTC_FROM_HOST,
+						  SL_SI91X_CUSTOM_FEAT_RTC_FROM_HOST |
+						  SL_SI91X_CUSTOM_FEAT_SOC_CLK_CONFIG_120MHZ,
 			.ext_custom_feature_bit_map =
 				SL_SI91X_EXT_FEAT_XTAL_CLK | SL_SI91X_EXT_FEAT_1P8V_SUPPORT |
 				SL_SI91X_EXT_FEAT_DISABLE_XTAL_CORRECTION |
@@ -331,6 +332,9 @@ static int siwx91x_get_nwp_config(const struct device *dev,
 				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}
 	};
 
 	sl_si91x_boot_configuration_t *boot_config = &default_config.boot_config;