MPC837XERDB: Move CONFIG_PCIE to Kconfig

Move this symbol to the board Kconfig file.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/freescale/mpc837xerdb/Kconfig b/board/freescale/mpc837xerdb/Kconfig
index 03415f9..3779625 100644
--- a/board/freescale/mpc837xerdb/Kconfig
+++ b/board/freescale/mpc837xerdb/Kconfig
@@ -1,5 +1,8 @@
 if TARGET_MPC837XERDB
 
+config PCIE
+	def_bool y
+
 config SYS_BOARD
 	default "mpc837xerdb"