m68knommu: fix misnamed GPIO pin definition for ColdFire 528x CPU

Compiling for a ColdFire 528x CPU will result in:

arch/m68k/platform/coldfire/m528x.c: In function ‘m528x_uarts_init’:
arch/m68k/platform/coldfire/m528x.c:72: error: ‘MCF5282_GPIO_PUAPAR’ undeclared (first use in this function)
arch/m68k/platform/coldfire/m528x.c:72: error: (Each undeclared identifier is reported only once
arch/m68k/platform/coldfire/m528x.c:72: error: for each function it appears in.)

The MCF5282_GPIO_PUAPAR definition changed names in the ColdFire definitions
cleanup. It is now MCFGPIO_PUAPAR, so change it.

Not sure how this one got missed, 2 lines below it is the correct use of
this definition.
Signed-off-by: NGreg Ungerer <gerg@uclinux.org>

arch/m68k/platform/coldfire/m528x.c

@@ -69,7 +69,7 @@ static void __init m528x_uarts_init(void)
 	u8 port;
 
 	/* make sure PUAPAR is set for UART0 and UART1 */
-	port = readb(MCF5282_GPIO_PUAPAR);
+	port = readb(MCFGPIO_PUAPAR);
 	port |= 0x03 | (0x03 << 2);
 	writeb(port, MCFGPIO_PUAPAR);
 }