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/arch/arm/mach-rockchip/rk3368-board-spl.c b/arch/arm/mach-rockchip/rk3368-board-spl.c
index cabf344..72d2c97 100644
--- a/arch/arm/mach-rockchip/rk3368-board-spl.c
+++ b/arch/arm/mach-rockchip/rk3368-board-spl.c
@@ -38,13 +38,13 @@
 	/* Set up our preloader console */
 	ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
 	if (ret) {
-		error("%s: pinctrl init failed: %d\n", __func__, ret);
+		pr_err("%s: pinctrl init failed: %d\n", __func__, ret);
 		hang();
 	}
 
 	ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_UART0);
 	if (ret) {
-		error("%s: failed to set up console UART\n", __func__);
+		pr_err("%s: failed to set up console UART\n", __func__);
 		hang();
 	}