Hardwire PMAC_TX_EN to zero as temporary measure #497

Job	Run time
Start self hosted aws runner	1m 25s
test	2h 53m 32s
make_boot (zynq, PandABox-no-fmc)	50m 32s
make_zpkg (PandABox-no-fmc)	1h 25m 15s
make_boot (zynqmp, xu5_st1-no-fmc)	57m 17s
make_zpkg (PandABox-fmc_24vio)	1h 25m 5s
make_zpkg (PandABox-fmc_acq427)	1h 14m 11s
make_zpkg (PandABox-fmc_acq430)	1h 30m 23s
make_zpkg (PandABox-fmc_lback-sfp_lback)	1h 25m 5s
make_zpkg (ZedBoard-no-fmc)	47m 42s
setup rclone and mount on runner	1m 42s
make zpkg on aws (xu5_st1-no-fmc)	42m 10s
make zpkg on aws (xu5_st1-fmc_acq430)	31m 46s
Stop self hosted EC2 runnner	7s
release	0s
	13h 46m 12s

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