mtd: nand: lpc32xx mlc: predefine number of NAND chips to support

Build option CONFIG_SYS_MAX_NAND_CHIPS is used by NXP LPC32xx NAND MLC
driver only, as a preparation for potential removal or replacement of
the option the change predefines CONFIG_SYS_MAX_NAND_CHIPS to 1, same
value is used by the single user Work Microwave Work 92105 board, thus
it will be safe now to remove the option as a board specific one.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>

drivers/mtd/nand/raw/lpc32xx_nand_mlc.c

@@ -82,6 +82,10 @@ struct lpc32xx_nand_mlc_registers {
 static struct lpc32xx_nand_mlc_registers __iomem *lpc32xx_nand_mlc_registers
 	= (struct lpc32xx_nand_mlc_registers __iomem *)MLC_NAND_BASE;
 
+#if !defined(CONFIG_SYS_MAX_NAND_CHIPS)
+#define CONFIG_SYS_MAX_NAND_CHIPS	1
+#endif
+
 #define clkdiv(v, w, o) (((1+(clk/v)) & w) << o)
 
 /**