build fix: adf_os_export_symbol is a dead end macro

adf_os_export_symbol points to __adf_os_export_symbol
but __adf_os_export_symbol is not defined.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: convert type for VBUF_GET_DATA_ADDR

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: use ath_hal_memcpy instead of memcpy

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Merge pull request #21 from olerem/buildfixes

Buildfixes, final pull