[sky2] Use 32-bit read to read Y2_VAUX_AVAIL

B0_CTST is a 24bit register according to the vendor driver (sk98lin).
A 16bit read on B0_CTST will always return 0 for Y2_VAUX_AVAIL
(1<<16), so use a 32bit read when testing Y2_VAUX_AVAIL.

[This patch is copied directly from the Linux kernel tree.]

Signed-off-by: Mike McCormack <mikem@ring3k.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/sky2.c

 			    Y2_COR_CLK_LNK2_DIS | Y2_CLK_GAT_LNK2_DIS);
 
 	/* switch power to VAUX */
-	if (sky2_read16(hw, B0_CTST) & Y2_VAUX_AVAIL)
+	if (sky2_read32(hw, B0_CTST) & Y2_VAUX_AVAIL)
 		sky2_write8(hw, B0_POWER_CTRL,
 			    (PC_VAUX_ENA | PC_VCC_ENA |
 			     PC_VAUX_ON | PC_VCC_OFF));

src/drivers/net/sky2.h

 	Y2_CFG_AER      = 0x1d00,	/* PCI Advanced Error Report region */
 };
 
-/*	B0_CTST			16 bit	Control/Status register */
+/*	B0_CTST			24 bit	Control/Status register */
 enum {
 	Y2_VMAIN_AVAIL	= 1<<17,/* VMAIN available (YUKON-2 only) */
 	Y2_VAUX_AVAIL	= 1<<16,/* VAUX available (YUKON-2 only) */