Convert CONFIG_NORFLASH_PS32BIT to Kconfig

This converts the following to Kconfig:
   CONFIG_NORFLASH_PS32BIT

Note that we also attempt to correct the behavior of the code here,
which had been testing for "NORFLASH_PS32BIT" which would never be set,
instead check for the now set "CONFIG_NORFLASH_PS32BIT", which results
in some behavior change.

Cc: TsiChung Liew <Tsi-Chung.Liew@nxp.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/freescale/m5235evb/Kconfig b/board/freescale/m5235evb/Kconfig
index fc83419..f0d4c8c 100644
--- a/board/freescale/m5235evb/Kconfig
+++ b/board/freescale/m5235evb/Kconfig
@@ -12,4 +12,7 @@
 config SYS_CONFIG_NAME
 	default "M5235EVB"
 
+config NORFLASH_PS32BIT
+	bool "Board has 32bit CFI flash"
+
 endif