zephyr: Add help for the ITE TCPM drivers
zephyr: Add help for the ITE TCPM drivers

These Kconfigs are missing the help text. Add some.

Also drop the unnecessary and confusing 'default n' lines nearby. Once
people see these in the code, they will multiply.

BUG=b:189855648
BRANCH=none
TEST=with other CLs, build asurada for Zephyr

Signed-off-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>
Change-Id: I8d6a327a2fbd57a0f25244e85424692c0d808b3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2941821
Reviewed-by: Denis Brockus <6b21e8190fb5e373363fb95271367073a16474ef@chromium.org>
Tested-by: Denis Brockus <6b21e8190fb5e373363fb95271367073a16474ef@chromium.org>
Commit-Queue: Denis Brockus <6b21e8190fb5e373363fb95271367073a16474ef@chromium.org>

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