Exynos5420: Make SPI driver less chatty

Only have the SPI driver produce output when CONFIG_DEBUG_SPI is
enabled.

BRANCH=none
TEST=booted on Pit, saw SPI messages from spi_claim_bus() go away
BUG=none

Change-Id: Ib911182b9b6a85e1a7b308f03c9b1bdba2fa0bf4
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: https://chromium-review.googlesource.com/170026
Tested-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-by: David Hendrix <dhendrix@chromium.org>
1 file changed