lib: cosmetic update of CONFIG_LIB_ELF description

Change 2 typo error in CONFIG_LIB_ELF description:
- Supoort => Support
- fir => for

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed