mb/google/rex: Use FW_CONFIG for generating ACPI code for WIFI

This patch avoids creating runtime ACPI for unused WIFI solutions.
For example: if the Rex SKU is with WIFI_CNVI then you don't need
to populate ACPI code for WIFI_PCIE.

FW_CONIG can be used for making those decisions.

TEST=No ASL entries being created for WIFI_PCIE if the FW_CONIG is
set to WIFI_CNVI.

Also, helped to save the boot time on google/rex (FSP-S API) by 9ms.

Change-Id: I60e4332d8d8c360fdf425b30513ff79209979e85
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74147
Reviewed-by: YH Lin <yueherngl@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

src/mainboard/google/rex/variants/rex0/overridetree.cb

@@ -248,7 +248,9 @@ chip soc/intel/meteorlake
 				register "wake" = "GPE0_PME_B0"
 				register "add_acpi_dma_property" = "true"
 				register "enable_cnvi_ddr_rfim" = "true"
-				device generic 0 on end
+				device generic 0 on
+					probe WIFI WIFI_CNVI
+				end
 			end
 		end
 		device ref ipu on
@@ -500,6 +502,7 @@ chip soc/intel/meteorlake
 			end
 		end #I2C5
 		device ref pcie_rp5 on
+			probe WIFI WIFI_PCIE
 			# Enable WLAN Card PCIE 5 using clk 5
 			register "pcie_rp[PCH_RP(5)]" = "{
 				.clk_src = 5,
@@ -509,13 +512,17 @@ chip soc/intel/meteorlake
 			chip drivers/wifi/generic
 				register "wake" = "GPE0_DW2_09"
 				register "add_acpi_dma_property" = "true"
-				device pci 00.0 on end
+				device pci 00.0 on
+					probe WIFI WIFI_PCIE
+				end
 			end
 			chip soc/intel/common/block/pcie/rtd3
 				register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_E22)"
 				register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_F08)"
 				register "srcclk_pin" = "5"
-				device generic 0 on end
+				device generic 0 on
+					probe WIFI WIFI_PCIE
+				end
 			end
 		end	#PCIE5 WLAN card
 		device ref pcie_rp6 on