zephyr: Use clearer prompts for config options
zephyr: Use clearer prompts for config options

At present the useless word 'Enable' appears in lots of the options,
making it harder to read what is actually important, the thing being
enabled.

Also some options have pretty poor help, which does not set a good
example for the future.

Tidy up these things.

BUG=b:176449230
BRANCH=none
TEST=ninja -C /tmp/z/vol/build-ro menuconfig
Check the options read a bit better

Change-Id: I3f4c2d21a52e9776b85c27a72701cf3a7e584728
Signed-off-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2606578
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>
Reviewed-by: Yuval Peress <50dc11c009bd4d7e9d9d15a383c1743ce5ee82ef@chromium.org>
Reviewed-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>

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