powerpc: C29XPCIE: Remove macro CONFIG_C29XPCIE

Use CONFIG_TARGET_C29XPCIE instead.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/configs/C29XPCIE_SPIFLASH_defconfig b/configs/C29XPCIE_SPIFLASH_defconfig
index 9f89263..43c88ee 100644
--- a/configs/C29XPCIE_SPIFLASH_defconfig
+++ b/configs/C29XPCIE_SPIFLASH_defconfig
@@ -5,7 +5,7 @@
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
-CONFIG_SYS_EXTRA_OPTIONS="C29XPCIE,SPIFLASH"
+CONFIG_SYS_EXTRA_OPTIONS="SPIFLASH"
 CONFIG_BOOTDELAY=-1
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_HUSH_PARSER=y