powerpc: P1_P2_RDB_PC: Drop TARGET_P1_P2_RDB_PC

All boards covered by this group have been converted to their own
targers. Drop TARGET_P1_P2_RDB_PC from Kconfig.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/p1_p2_rdb_pc/Kconfig b/board/freescale/p1_p2_rdb_pc/Kconfig
index fb506d4..2f9640b 100644
--- a/board/freescale/p1_p2_rdb_pc/Kconfig
+++ b/board/freescale/p1_p2_rdb_pc/Kconfig
@@ -1,5 +1,4 @@
-if TARGET_P1_P2_RDB_PC		|| \
-	TARGET_P1020MBG		|| \
+if TARGET_P1020MBG		|| \
 	TARGET_P1020RDB_PC	|| \
 	TARGET_P1020RDB_PD	|| \
 	TARGET_P1020UTM		|| \