mqxboot: Add minor changes to get recipe in better shape
In order to use the same pattern from other recipes, the following
changes were made in recipe:
- Use summary as the description was short
- Drop vendor from summary
- Put RDEPENDS after source fields
- Add empty line between S and CFLAGS
- Drop extra space in CFLAGS appending
Change-Id: I6adb237ffaae3b24ac2b28855d31ae93a3d019cb Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>