stmark2: Remove CONFIG_SERIAL_FLASH

This is not referenced anywhere, remove it.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/stmark2.h b/include/configs/stmark2.h
index b016787..e1f2ee0 100644
--- a/include/configs/stmark2.h
+++ b/include/configs/stmark2.h
@@ -39,9 +39,6 @@
 #define CONFIG_RTC_MCFRRTC
 #define CONFIG_SYS_MCFRRTC_BASE		0xFC0A8000
 
-/* DSPI and Serial Flash */
-#define CONFIG_SERIAL_FLASH
-
 #define CONFIG_SYS_SBFHDR_SIZE		0x7
 
 /* Input, PCI, Flexbus, and VCO */