treewide: replace with error() with pr_err()

U-Boot widely uses error() as a bit noisier variant of printf().

This macro causes name conflict with the following line in
include/linux/compiler-gcc.h:

  # define __compiletime_error(message) __attribute__((error(message)))

This prevents us from using __compiletime_error(), and makes it
difficult to fully sync BUILD_BUG macros with Linux.  (Notice
Linux's BUILD_BUG_ON_MSG is implemented by using compiletime_assert().)

Let's convert error() into now treewide-available pr_err().

Done with the help of Coccinelle, excluing tools/ directory.

The semantic patch I used is as follows:

// <smpl>
@@@@
-error
+pr_err
 (...)
// </smpl>

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
[trini: Re-run Coccinelle]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/usb/host/xhci-dwc3.c b/drivers/usb/host/xhci-dwc3.c
index 4191a89..258d1cd 100644
--- a/drivers/usb/host/xhci-dwc3.c
+++ b/drivers/usb/host/xhci-dwc3.c
@@ -128,13 +128,13 @@
 	ret = generic_phy_get_by_index(dev, 0, &plat->usb_phy);
 	if (ret) {
 		if (ret != -ENOENT) {
-			error("Failed to get USB PHY for %s\n", dev->name);
+			pr_err("Failed to get USB PHY for %s\n", dev->name);
 			return ret;
 		}
 	} else {
 		ret = generic_phy_init(&plat->usb_phy);
 		if (ret) {
-			error("Can't init USB PHY for %s\n", dev->name);
+			pr_err("Can't init USB PHY for %s\n", dev->name);
 			return ret;
 		}
 	}
@@ -161,7 +161,7 @@
 	if (generic_phy_valid(&plat->usb_phy)) {
 		ret = generic_phy_exit(&plat->usb_phy);
 		if (ret) {
-			error("Can't deinit USB PHY for %s\n", dev->name);
+			pr_err("Can't deinit USB PHY for %s\n", dev->name);
 			return ret;
 		}
 	}