Log one line from board start up with the pad count and how many differ
from their reset defaults, through eic7700x_pinctrl_count(). A helper
holds its locals so nothing stays on the stack for the bring up that
follows.
Turn the pinctrl driver's error output on for both boards, so a refused
pad write says why rather than merely failing.
Assisted-by: Claude:claude-opus-5
Signed-off-by: Justin Hammond <justin@dynam.ac>