arm: Move SYS_FSL_IFC_BANK_COUNT to Kconfig

Move this option to Kconfig and clean up existing uses.
This option is also used by PowerPC SoCs.

Signed-off-by: York Sun <york.sun@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/armv7/ls102xa/Kconfig b/arch/arm/cpu/armv7/ls102xa/Kconfig
index e8264f5..88983f4 100644
--- a/arch/arm/cpu/armv7/ls102xa/Kconfig
+++ b/arch/arm/cpu/armv7/ls102xa/Kconfig
@@ -23,4 +23,9 @@
 config SYS_FSL_ERRATUM_A010315
 	bool "Workaround for PCIe erratum A010315"
 
+config SYS_FSL_IFC_BANK_COUNT
+	int "Maximum banks of Integrated flash controller"
+	depends on ARCH_LS1021A
+	default 8
+
 endmenu