crossystem: Fix error message when passing invalid parameter

When setting crossystem parameters with various errors, the error
message was always "Parameter dev_default_boot is read-only". Display
various error messages based on the types of errors.

BRANCH=none
BUG=chromium:965799
TEST=emerge-nami vboot_reference

Change-Id: I185ce5f9c142da538f86b6c6c298f5a76377e395
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1982431
Reviewed-by: Joel Kitching <kitching@chromium.org>
1 file changed