asurada: enable PSYS ADC
asurada: enable PSYS ADC

enable CONFIG_CHARGER_PSYS and CONFIG_CHARGER_PSYS_READ for
Psys reading on isl9238.

BRANCH=master
BUG=b:150341271
TEST=see output from command psys

Change-Id: I6bf86b1ccee473d543901b1131528099bd6a1e16
Signed-off-by: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2214443
Reviewed-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>

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