tools: fix ldgen_test fragment file KEEP
@@ -4,5 +4,5 @@ entries:
* (noflash)
src1 (default)
src1:func1 (noflash);
- text->iram0_text KEEP ALIGN(9) ALIGN(12, post) SURROUND(sym1)
+ text->iram0_text KEEP() ALIGN(9) ALIGN(12, post) SURROUND(sym1)
src1:func2 (rtc)
