Staging: ti-st: make use of linux err codes

remove custom error code definitions from the header and
make use of the agreed upon linux error codes.

Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --cc drivers/staging/ti-st/bt_drv.c
Simple merge

diff --cc drivers/staging/ti-st/st.h
Simple merge

diff --cc drivers/staging/ti-st/st_core.c
Simple merge

diff --cc drivers/staging/ti-st/st_kim.c
Simple merge

diff --cc drivers/staging/ti-st/st_ll.c
Simple merge