drm/bridge: analogix_dp: Apply standard DP training delay helpers

Replace hardcoded fixed usleep_range() delays during clock recovery and
channel equalization with drm_dp_link_train_clock_recovery_delay()
and drm_dp_link_train_channel_eq_delay() helpers.

The original fixed delays are only valid for the case where bit[6:0] of
DPCD TRAINING_AUX_RD_INTERVAL(0000Eh) is 0x00, while core helpers apply
spec-compliant timings matching actual receiver capability values.

Additionally, add dpcd buffer to struct analogix_dp_device to cache
receiver capabilities. Call drm_dp_read_dpcd_caps() at commit entry to
populate cached DPCD data for subsequent link training steps, and
prepare for further usage of other DP helper APIs.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Tested-by: Vicente Bergas <vicencb@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patch.msgid.link/20260623075207.320603-1-damon.ding@rock-chips.com

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