net: atlantic: add AQC113 PTP hardware ops in hw_atl2

net: atlantic: add AQC113 PTP hardware ops in hw_atl2

Add the hardware-layer PTP implementation for AQC113 (Antigua):

- hw_atl2.h/hw_atl2_utils.h/hw_atl2_internal.h: add PTP offset
  constants, RX timestamp size (HW_ATL2_RX_TS_SIZE=8), and reduced
  HW_ATL2_RXBUF_MAX=172 (AQC113 on-chip RX packet buffer hardware
  limit for data TCs).

- hw_atl2.c: implement hw_atl2_enable_ptp() to reset and enable TSG
  clocks and set PTP TC scheduling priority after hardware reset.

- hw_atl2.c: implement hw_atl2_adj_sys_clock(), hw_atl2_adj_clock_freq(),
  and aq_get_ptp_ts() for TSG clock read/adjust/increment operations.

- hw_atl2.c: implement hw_atl2_gpio_pulse() for PPS output generation
  via TSG pulse generator.

- hw_atl2.c: implement hw_atl2_hw_tx_ptp_ring_init() and
  hw_atl2_hw_rx_ptp_ring_init() for PTP ring setup.

- hw_atl2.c: implement hw_atl2_hw_ring_tx_ptp_get_ts() to read TX
  timestamp from descriptor writeback, and hw_atl2_hw_rx_extract_ts()
  to extract RX timestamp from the 8-byte packet trailer.

- hw_atl2.c: add hw_atl2_hw_get_clk_sel() helper.

- Wire all new ops into hw_atl2_ops.

Signed-off-by: Sukhdeep Singh <sukhdeeps@marvell.com>
Link: https://patch.msgid.link/20260610115448.272-11-sukhdeeps@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>