misc: habanalabs: goya: goya_coresight: Remove set but unused variable 'val'

misc: habanalabs: goya: goya_coresight: Remove set but unused variable 'val'

No attempt to check the return value of RREG32() has been made
since the call was introduced a year ago.

Fixes W=1 kernel build warning:

 drivers/misc/habanalabs/goya/goya_coresight.c: In function ‘goya_debug_coresight’:
 drivers/misc/habanalabs/goya/goya_coresight.c:643:6: warning: variable ‘val’ set but not used [-Wunused-but-set-variable]
 643 | u32 val;
 | ^~~

Cc: Oded Gabbay <oded.gabbay@gmail.com>
Cc: Tomer Tayar <ttayar@habana.ai>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Link: https://lore.kernel.org/r/20200701085853.164358-9-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>