powerpc: BSC9131/2: Move CONFIG_BSC9131/2 to Kconfig options

Replace CONFIG_BSC9131, CONFIG_BSC9132 with ARCH_BSC9131, ARCH_BSC9132
Kconfig options.

Also drop #ifdef in BSC9131RDB.h since it is redundant.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/powerpc/include/asm/fsl_law.h b/arch/powerpc/include/asm/fsl_law.h
index 2a759c8..85278b3 100644
--- a/arch/powerpc/include/asm/fsl_law.h
+++ b/arch/powerpc/include/asm/fsl_law.h
@@ -82,7 +82,7 @@
 #ifndef CONFIG_MPC8641
 	LAW_TRGT_IF_PCIE_1 = 0x02,
 #endif
-#if defined(CONFIG_BSC9131) || defined(CONFIG_BSC9132)
+#if defined(CONFIG_ARCH_BSC9131) || defined(CONFIG_ARCH_BSC9132)
 	LAW_TRGT_IF_OCN_DSP = 0x03,
 #else
 #if !defined(CONFIG_MPC8572) && !defined(CONFIG_P2020)
@@ -95,7 +95,7 @@
 	LAW_TRGT_IF_PLATFORM_SRAM = 0x0a,
 	LAW_TRGT_IF_DDR_INTRLV = 0x0b,
 	LAW_TRGT_IF_RIO = 0x0c,
-#if defined(CONFIG_BSC9132)
+#if defined(CONFIG_ARCH_BSC9132)
 	LAW_TRGT_IF_CLASS_DSP = 0x0d,
 #else
 	LAW_TRGT_IF_RIO_2 = 0x0d,