servo_v4p1: Detect and configure PCAL6524HE
servo_v4p1: Detect and configure PCAL6524HE

Detect and configure PCAL6524HE if found.

BUG=b:210015396
TEST=make -j BOARD=servo_v4p1
     Test that the PCAL6524HE was detected and properly configured
     Test that the TCA6424 continued to work as expected.
BRANCH=main

Signed-off-by: Sam Hurst <500b4cddcd66abe3fe333e92c4c95d7f41e62e4e@google.com>

Change-Id: If1dcd90fc76b2e04c4fccf375aa00d58c5039abf
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3556492
Tested-by: Sam Hurst <500b4cddcd66abe3fe333e92c4c95d7f41e62e4e@google.com>
Reviewed-by: Brian Nemec <4bb9322d2721abaa797f20e8e3863e6a19240e0a@google.com>
Commit-Queue: Sam Hurst <500b4cddcd66abe3fe333e92c4c95d7f41e62e4e@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec