spi: intel: Only look for TFS and RFS in status when handling isr

If those are not set it means the controller has nothing to request
anymore from the driver.

Change-Id: Ie7e834e82b931e4b02ded3f9f619735b31b0a121
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
diff --git a/drivers/spi/intel_spi.c b/drivers/spi/intel_spi.c
index cfef434..a08d741 100644
--- a/drivers/spi/intel_spi.c
+++ b/drivers/spi/intel_spi.c
@@ -365,11 +365,11 @@
 		goto out;
 	}
 
-	if (status & (INTEL_SPI_SSSR_RFS | INTEL_SPI_SSSR_RNE)) {
+	if (status & INTEL_SPI_SSSR_RFS) {
 		pull_data(dev);
 	}
 
-	if (status & (INTEL_SPI_SSSR_TFS | INTEL_SPI_SSSR_TNF)) {
+	if (status & INTEL_SPI_SSSR_TFS) {
 		push_data(dev);
 	}