powerpc: P1020RDB-PC: Separate from P1_P2_RDB_PC in Kconfig

Use TARGET_P1020RDB_PC instead of sharing with TARGET_P1_P2_RDB_PC
to simplify Kconfig and config macros.

Remove macro CONFIG_P1020RDB_PC.

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 2c45560..6fa6859 100644
--- a/board/freescale/p1_p2_rdb_pc/Kconfig
+++ b/board/freescale/p1_p2_rdb_pc/Kconfig
@@ -1,5 +1,6 @@
-if TARGET_P1_P2_RDB_PC || \
-	TARGET_P1020MBG
+if TARGET_P1_P2_RDB_PC		|| \
+	TARGET_P1020MBG		|| \
+	TARGET_P1020RDB_PC
 
 config SYS_BOARD
 	default "p1_p2_rdb_pc"
diff --git a/board/freescale/p1_p2_rdb_pc/ddr.c b/board/freescale/p1_p2_rdb_pc/ddr.c
index a121256..2abe840 100644
--- a/board/freescale/p1_p2_rdb_pc/ddr.c
+++ b/board/freescale/p1_p2_rdb_pc/ddr.c
@@ -109,7 +109,7 @@
 	.refresh_rate_ps = 7800000,
 	.tfaw_ps = 37500,
 };
-#elif defined(CONFIG_P1020RDB_PC)
+#elif defined(CONFIG_TARGET_P1020RDB_PC)
 /*
  * Samsung K4B2G0846C-HCF8
  * The following timing are for "downshift"
diff --git a/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c b/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
index d61c3a5..1a8744e 100644
--- a/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
+++ b/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
@@ -428,7 +428,7 @@
 {
 	phys_addr_t base;
 	phys_size_t size;
-#if defined(CONFIG_P1020RDB_PD) || defined(CONFIG_P1020RDB_PC)
+#if defined(CONFIG_P1020RDB_PD) || defined(CONFIG_TARGET_P1020RDB_PC)
 	const char *soc_usb_compat = "fsl-usb2-dr";
 	int usb_err, usb1_off, usb2_off;
 #endif
@@ -478,7 +478,7 @@
 	}
 #endif
 
-#if defined(CONFIG_P1020RDB_PD) || defined(CONFIG_P1020RDB_PC)
+#if defined(CONFIG_P1020RDB_PD) || defined(CONFIG_TARGET_P1020RDB_PC)
 /* Delete USB2 node as it is muxed with eLBC */
 	usb1_off = fdt_node_offset_by_compatible(blob, -1,
 		soc_usb_compat);