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>

arch/powerpc/cpu/mpc85xx/Kconfig

@@ -155,11 +155,6 @@ config TARGET_P2020RDB
 	select SUPPORT_SPL
 	select SUPPORT_TPL
 
-config TARGET_P1_P2_RDB_PC
-	bool "Support p1_p2_rdb_pc"
-	select SUPPORT_SPL
-	select SUPPORT_TPL
-
 config TARGET_P1_TWR
 	bool "Support p1_twr"
 

board/freescale/p1_p2_rdb_pc/Kconfig

-if TARGET_P1_P2_RDB_PC		|| \
-	TARGET_P1020MBG		|| \
+if TARGET_P1020MBG		|| \
 	TARGET_P1020RDB_PC	|| \
 	TARGET_P1020RDB_PD	|| \
 	TARGET_P1020UTM		|| \