powerpc: BSC9132QDS: Remove CONFIG_BSC9132QDS macro

Use CONFIG_TARGET_BSC9132QDS from Kconfig option, remove CONFIG_BSC9132QDS
macro.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/configs/BSC9132QDS_NOR_DDRCLK100_defconfig b/configs/BSC9132QDS_NOR_DDRCLK100_defconfig
index dc75009..db14156 100644
--- a/configs/BSC9132QDS_NOR_DDRCLK100_defconfig
+++ b/configs/BSC9132QDS_NOR_DDRCLK100_defconfig
@@ -5,7 +5,7 @@
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
-CONFIG_SYS_EXTRA_OPTIONS="BSC9132QDS,SYS_CLK_100_DDR_100"
+CONFIG_SYS_EXTRA_OPTIONS="SYS_CLK_100_DDR_100"
 CONFIG_BOOTDELAY=10
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_HUSH_PARSER=y