sm8150-common: Temporarily remove `write wlan_mac.bin ""` instruction

For some reason, Android R RIL stack no longer dumps NV items on boot
so we are always falling back to random MAC address generation.

Since we don't seed random number generator with serial number we are
always ending up with completely random WLAN MAC suffix every boot,
this change makes it so that we at least stick to one randomly
generated WLAN MAC at least until OnePlus fixes their RIL stack.

Change-Id: If23c6008bb6c1480c500032fb2f1bcd052f999a0