boards: adi: max32666fthr: Remove sdhc from supported list of features

SDHC support was disabled in commit
e674709 due to unresolved runtime
twister failures observed after rebasing adi-main to Zephyr v4.1,
however the feature was still left in the board's list of supported
features. This caused twister to continue selecting
tests/drivers/disk/disk_performance for the board, which fails to build,
and thus continued failures in ci. It was mainly observed on push events
because recent PRs haven't changed anything in this area.

Signed-off-by: Maureen Helm <[email protected]>

Author: MaureenHelm

boards/adi/max32666fthr/max32666fthr_max32666_cpu0.yaml

@@ -20,6 +20,5 @@ supported:
   - pwm
   - w1
   - flash
-  - sdhc
 ram: 128
 flash: 1024