[PATCH] ptp_pch: include ethernet driver for external functions

["Ben Dooks (Codethink)" <ben.dooks@codethink.co.uk>]

The driver uses a number of functions from the ethernet driver
so include the header to remove the following warnings from
sparse about undeclared functions:

drivers/ptp/ptp_pch.c:182:5: warning: symbol 'pch_ch_control_read' was not declared. Should it be static?
drivers/ptp/ptp_pch.c:193:6: warning: symbol 'pch_ch_control_write' was not declared. Should it be static?
drivers/ptp/ptp_pch.c:201:5: warning: symbol 'pch_ch_event_read' was not declared. Should it be static?
drivers/ptp/ptp_pch.c:212:6: warning: symbol 'pch_ch_event_write' was not declared. Should it be static?
drivers/ptp/ptp_pch.c:220:5: warning: symbol 'pch_src_uuid_lo_read' was not declared. Should it be static?
drivers/ptp/ptp_pch.c:231:5: warning: symbol 'pch_src_uuid_hi_read' was not declared. Should it be static?
drivers/ptp/ptp_pch.c:242:5: warning: symbol 'pch_rx_snap_read' was not declared. Should it be static?
drivers/ptp/ptp_pch.c:259:5: warning: symbol 'pch_tx_snap_read' was not declared. Should it be static?
drivers/ptp/ptp_pch.c:300:5: warning: symbol 'pch_set_station_address' was not declared. Should it be static?

Should we include the header file from the ethernet driver directly
or if not, where should the declarations go?

Signed-off-by: Ben Dooks (Codethink) <ben.dooks@codethink.co.uk>
---
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/ptp/ptp_pch.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/ptp/ptp_pch.c b/drivers/ptp/ptp_pch.c
index dcd6e00c8046..2bb1184b6359 100644
--- a/drivers/ptp/ptp_pch.c
+++ b/drivers/ptp/ptp_pch.c
@@ -20,6 +20,8 @@
 #include <linux/ptp_clock_kernel.h>
 #include <linux/slab.h>
 
+#include <../net/ethernet/oki-semi/pch_gbe/pch_gbe.h>
+
 #define STATION_ADDR_LEN	20
 #define PCI_DEVICE_ID_PCH_1588	0x8819
 #define IO_MEM_BAR 1
-- 
2.23.0