hal: ambiq: apollo510: add I2S full-duplex and GPIO pin fixes
Bring Apollo510 I2S HAL changes needed by the Zephyr I2S driver: separate TX/RX DMA enable handling, TX FIFO empty interrupt, and related interrupt mask programming for full-duplex operation.
Also sync the Apollo510 GPIO drive-strength table bit and AM_HAL_PIN_46_CLKOUT_HFXTAL define from AmbiqSuite SDK 5.2.0.
Signed-off-by: Richard Wheatley richard.wheatley@ambiq.com
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