[NUCLEO_L152RE] Add LSE configuration for RTC and...

... remove trailing spaces, typo corrections
[NUCLEO_F103RB] Add LSE configuration for RTC
[NUCLEO_F103RB] Remove trailing spaces, typo corrections
[LPC1549, 11U68] Added RTOS support
Merge remote-tracking branch 'upstream/master'
Merge pull request #283 from toyowata/master

[LPC1549, 11U68] Added RTOS support