servo_v4p1: Improve handling of DACs' faults
servo_v4p1: Improve handling of DACs' faults

Fix handling CC2 line fault. CC2 line was not checked, instead,
CC1 was used in both checks.
Change message that appear on servo's console after detecting
DACs' faults.
Now, after detecting fault on CC lines, corresponding DAC will be
disabled and fault will be cleared.

BUG=b:168730704
BRANCH=main
TEST=On servo's console execute commands as follows.
     For CC1:
     > i2cxfer w16 1 0x48 0x8 0x0080
     > i2cxfer w 1 0x23 4 0x12
     Short DUT_CC1 pin to ground. Message about CC1 DAC fault should
     appear on console.
     For CC2:
     > i2cxfer w16 1 0x49 0x8 0x0080
     > i2cxfer w 1 0x23 4 0x22
     Short DUT_CC2 pin to ground. Message about CC2 DAC fault should
     appear on console.

Signed-off-by: Michał Barnaś <77666125932addc6fc525b281b518fd8fd2203d8@semihalf.com>
Change-Id: I32b727790dcc54355a5211a667c091287aa04b3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2732017
Reviewed-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Commit-Queue: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>

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