[L] Change in coreboot[main]: mb/google/brox: Create jubilant variant

[Bob Moragues (Code Review)]

Attention is currently required from: David Wu, Ren Kuo, Shelley Chen, Subrata Banik, YH Lin.

Bob Moragues has posted comments on this change by Ren Kuo. ( https://review.coreboot.org/c/coreboot/+/83212?usp=email )

Change subject: mb/google/brox: Create jubilant variant
......................................................................

Patch Set 17:

(1 comment)

File src/mainboard/google/brox/variants/jubilant/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/83212/comment/6e90761a_9cb2c6b7?usp... :
PS16, Line 1: fw_config
            : 	field STORAGE 2 3
            : 		option STORAGE_UNKNOWN			0
            : 		option STORAGE_UFS			1
            : 		option STORAGE_NVME			2
            : 	end
            : 	field WIFI_BT 4 4
            : 		option WIFI_BT_CNVI			0
            : 		option WIFI_BT_PCIE			1
            : 	end
            : 	field DB_USB 11 12
            : 		option DB_1A				0
            : 		option DB_1A_LTE			1
            : 	end
            : 	field FPMCU 17 18
            : 		option FPMCU_ABSENT			0
            : 		option FPMCU_NUVOTON			1
            : 	end
            : end
> This needs to match the config,star bits here: […]

This is what I came up with:

```
fw_config
    field RETIMER 0 1
    	option RETIMER_UNKNOWN 			0
    	option RETIMER_BYPASS			1
    	option RETIMER_JHL8040			2
    end
    field STORAGE 2 3
    	option STORAGE_UNKNOWN			0
    	option STORAGE_UFS			1
    	option STORAGE_NVME			2
    end
    field WIFI_BT 4 4
    	option WIFI_BT_CNVI			0
    	option WIFI_BT_PCIE			1
    end
    field AUDIO 5 7
    	option  AUDIO_UNKNOWN			0
    	option AUDIO_REALTEK_ALC256		1
    	option AUDIO_REALTEK_ALC3287		2
    end
    field UFC 8 9
    	option UFC_NONE				0
    	option UFC_USB				1
    end
    field KB_BL 10 10
    	option KB_BL_ABSENT			0
    	option KB_BL_PRESENT			1
    end
    field FPMCU 11 12
    	option FP_ABSENT			0
    	option FP_MCU_NUVOTON			1
    end
    field ISH 13 13
    	option ISP_DISABLED			0
    	option ISP_ENABLED			1
    end
    field DB_USB 14 15
    	option DB_1A				0
    	option DB_1A_LTE			1
    end
end

```