Convert CONFIG_A003399_NOR_WORKAROUND to Kconfig

This converts the following to Kconfig:
   CONFIG_A003399_NOR_WORKAROUND

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index a978eea..0e0b923 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -354,6 +354,7 @@
 
 config ARCH_P1010
 	bool
+	select A003399_NOR_WORKAROUND if SYS_FSL_ERRATUM_IFC_A003399 && !SPL
 	select BTB
 	select FSL_LAW
 	select SYS_CACHE_SHIFT_5
@@ -878,6 +879,12 @@
 		if changed by pre-boot regime. The value here must match
 		the current value in SoC. If not sure, do not change.
 
+config A003399_NOR_WORKAROUND
+	bool
+	help
+	  Enables a workaround for IFC erratum A003399. It is only required
+	  during NOR boot.
+
 config SYS_FSL_ERRATUM_A004468
 	bool