cmake: sca: Add "SCA" to the Found messages

This commit enhances the clarity of the build log by adding the "SCA"
prefix to the "Found" messages generated by sca/*/sca.cmake. This change
improves the readability of the `west build` log for users who may not be
familiar with these tools, providing more informative and understandable
output.

Signed-off-by: Yasushi SHOJI <yashi@spacecubics.com>