CMake: Fix LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING to be 1 or 0.
It has been introduced in #107278 but it was passing
"DISABLED" of LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING to cmakedefine01.
cmakadefine01 treats non-false-like strings as 1.
"DISABLED" is replaced with 1.