Fix EFR32MG24 build by purging more chip-specific config files #116

Job	Run time
List firmware manifests	3s
Run pre-commit	14s
Create build container image	12s
Firmware builder (manifests/skyconnect_bootloader-uart-xmodem.yaml)	2m 27s
Firmware builder (manifests/skyconnect_firmware-eraser.yaml)	2m 14s
Firmware builder (manifests/skyconnect_ncp-uart-hw.yaml)	2m 29s
Firmware builder (manifests/skyconnect_ot-rcp.yaml)	2m 28s
Firmware builder (manifests/skyconnect_rcp-uart-802154.yaml)	2m 35s
Firmware builder (manifests/slusb001a-lr2_zwave_ncp_serial_api_controller.yaml)	2m 26s
Firmware builder (manifests/slusb001a-lr_zwave_ncp_serial_api_controller.yaml)	2m 21s
Firmware builder (manifests/slusb001a_zwave_ncp_serial_api_controller.yaml)	2m 24s
Firmware builder (manifests/yellow_bootloader-uart-xmodem.yaml)	2m 20s
Firmware builder (manifests/yellow_ncp-uart-hw.yaml)	2m 25s
Firmware builder (manifests/yellow_ot-rcp.yaml)	2m 31s
Firmware builder (manifests/yellow_rcp-uart-802154.yaml)	2m 34s
Upload release assets	0s
	29m 43s

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