[FK407M1] Clean up boards.txt

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

boards.txt

@@ -657,12 +657,12 @@ GenF4.menu.pnum.DIYMROE_F407VGT.build.variant=DIYMROE_F407VGT
 # FK407M1
 # Support: Serial1 (USART1 on PA10, PA9)
 # Default SPI: SPI (SPI1 on PB3,PB4,PB5)
-GenF4.menu.pnum.BLACK_FK407M1=FK407M1 STM32F407VET
-GenF4.menu.pnum.BLACK_FK407M1.upload.maximum_size=524288
-GenF4.menu.pnum.BLACK_FK407M1.upload.maximum_data_size=131072
-GenF4.menu.pnum.BLACK_FK407M1.build.board=FK407M1
-GenF4.menu.pnum.BLACK_FK407M1.build.product_line=STM32F407xx
-GenF4.menu.pnum.BLACK_FK407M1.build.variant=FK407M1
+GenF4.menu.pnum.FK407M1=FK407M1 STM32F407VET
+GenF4.menu.pnum.FK407M1.upload.maximum_size=524288
+GenF4.menu.pnum.FK407M1.upload.maximum_data_size=131072
+GenF4.menu.pnum.FK407M1.build.board=FK407M1
+GenF4.menu.pnum.FK407M1.build.product_line=STM32F407xx
+GenF4.menu.pnum.FK407M1.build.variant=FK407M1
 
 # Upload menu
 GenF4.menu.upload_method.STLink=STLink