tools/cmake: carry preset.cmake DESCRIPTION quoting fix

Same one-char fix as pytorch#19117 (and our PR #2): the
DESCRIPTION argument to `set(...CACHE TYPE DOCSTRING)` was expanded
unquoted, so multi-word descriptions on STRING options passed via `-D`
spilled their trailing words into subsequent set() args.

This was latent until PR #3 introduced EXECUTORCH_VULKAN_FP16_PRECISION
with a multi-word help string — builds that set it (e.g. via
scripts/build_android_library.sh forwarding the env var) then fail.

Carried here so this branch remains self-contained and buildable
independent of the merge order of PR #2. Drops cleanly after PR #2
lands; git will treat the duplicate line as a no-op.

Author: jgibson2

tools/cmake/common/preset.cmake

@@ -82,12 +82,12 @@ macro(define_overridable_option NAME DESCRIPTION VALUE_TYPE DEFAULT_VALUE)
   if(DEFINED ${NAME} AND NOT DEFINED CACHE{${NAME}})
     set(${NAME}
         ${${NAME}}
-        CACHE ${VALUE_TYPE} ${DESCRIPTION} FORCE
+        CACHE ${VALUE_TYPE} "${DESCRIPTION}" FORCE
     )
   else()
     set(${NAME}
         ${DEFAULT_VALUE}
-        CACHE ${VALUE_TYPE} ${DESCRIPTION}
+        CACHE ${VALUE_TYPE} "${DESCRIPTION}"
     )
   endif()