video: tegra: host: move exported APIs to public header

Exported APIs like below are defined in private header file
nvhost_syncpt_unit_interface.h
nvhost_syncpt_unit_interface_get_aperture()
nvhost_syncpt_unit_interface_get_byte_offset()

This causes linking problems if these functions are needed
by some other driver outside nvhost

Hence move these exported APIs into a new public
header in include/linux/nvhost_t194.h

Change-Id: Ib70177da71c2cc6aee1c6da2668b0a92ea01ccf7
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1480588
Reviewed-by: Arto Merilainen <amerilainen@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Tested-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

include/linux/nvhost_t194.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2017, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef __LINUX_NVHOST_T194_H__
+#define __LINUX_NVHOST_T194_H__
+
+int nvhost_syncpt_unit_interface_get_aperture(
+				struct platform_device *host_pdev,
+				phys_addr_t *base,
+				size_t *size);
+
+u32 nvhost_syncpt_unit_interface_get_byte_offset(u32 syncpt_id);
+
+#endif /* __LINUX_NVHOST_T194_H__ */