pm9g45: fix compile warning

Fix warning:

	pm9g45.c: In function 'pm9g45_macb_hw_init':
	pm9g45.c:99: warning: unused variable 'pio'

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Ilko Iliev <iliev@ronetix.at>

board/ronetix/pm9g45/pm9g45.c

@@ -96,7 +96,6 @@ static void pm9g45_nand_hw_init(void)
 static void pm9g45_macb_hw_init(void)
 {
 	at91_pmc_t	*pmc	= (at91_pmc_t *) AT91_PMC_BASE;
-	at91_pio_t	*pio	= (at91_pio_t *) AT91_PIO_BASE;
 
 	/*
 	 * PD2 enables the 50MHz oscillator for Ethernet PHY