log: global: Rename warn_non_spl()

This should now refer to xPL rather than SPL, so update it throughout
the tree.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c
index 6e28172..f6efebd 100644
--- a/drivers/spi/spi-uclass.c
+++ b/drivers/spi/spi-uclass.c
@@ -538,7 +538,7 @@
 		mode |= SPI_TX_OCTAL;
 		break;
 	default:
-		warn_non_spl("spi-tx-bus-width %d not supported\n", value);
+		warn_non_xpl("spi-tx-bus-width %d not supported\n", value);
 		break;
 	}
 
@@ -556,7 +556,7 @@
 		mode |= SPI_RX_OCTAL;
 		break;
 	default:
-		warn_non_spl("spi-rx-bus-width %d not supported\n", value);
+		warn_non_xpl("spi-rx-bus-width %d not supported\n", value);
 		break;
 	}