platform: int3472: backport int3472 fixes of regulator setting for imx471 and increase the handshake delay

This work includes

1. imx471 regulator pin name settings [1]
2. extend the handshake delay[2]

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/platform/x86/intel/int3472/discrete.c?id=f8ae10fe4b81efb93e890e6601a92624e4b4a576
[2] https://gitlab.freedesktop.org/linux-media/media-committers/-/commit/844982d3b99340c21dd2125f44e1ad04ace6a38e

Signed-off-by: Kate Hsuan hpa@redhat.com