numicro: Integrate Nuvoton NuMicro flash driver.

Flash driver "mini51.c" and "nuc1x.c" are same target MCU.
This patch integrates each driver and functions,
and makes into new "NuMicro" flash driver.

Change-Id: Ifff5c1cfdd265acca0f489631695be9194fa144c
Signed-off-by: Nemui Trinomius <nemuisan_kawausogasuki@live.jp>
Reviewed-on: http://openocd.zylin.com/2794
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

src/flash/nor/Makefile.am

@@ -43,8 +43,7 @@ NOR_DRIVERS = \
 	fm3.c \
 	dsp5680xx_flash.c \
 	kinetis.c \
-	mini51.c \
-	nuc1x.c \
+	numicro.c \
 	nrf51.c \
 	mrvlqspi.c \
 	psoc4.c \