lmdk: Instruct linker to keep .buildinfo section

At the beginning of the .text section there must be a structure containing
information about the version of the api used by the library. It's absence
will cause sof to interpret a random literal as a version and incorrectly
load a library.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

lmdk/cmake/ldscripts/text_linker_script.txt

@@ -11,7 +11,7 @@ PHDRS {
 SECTIONS {
     .text : ALIGN(4096) {
         _text_start = ABSOLUTE(.);
-        *(.buildinfo)
+        KEEP(*(.buildinfo))
         *(.gnu.linkonce.literal.*)
         *(.gnu.linkonce.lit4)
         *(.literal)