Update libphy.a to v3960: 1. Decrease phy_init time from 900us to 347us in sleep wakeup 2. Fix RX STBC initialization 3. Modify set_chan function to fix interrupt watchdog issue
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-Subproject commit 828e45773609055cdd396cd7556aa142faf30003
+Subproject commit 62e3f71f35b228f354e6fd2ee8c743bacb55016e