Remove arch/${ARCH}/include/asm/errno.h

Unlike Linux, nothing about errno.h is arch-specific in U-Boot.
As you see, all of arch/${ARCH}/include/asm/errno.h is just a
wrapper of <asm-generic/errno.h>.  Actually, U-Boot does not
export headers to user-space, so we just have to care about the
consistency in the U-Boot tree.

Now all of include directives for <asm/errno.h> are gone.
Deprecate <asm/errno.h>.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NAlexey Brodkin <abrodkin@synopsys.com>

arch/arc/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/arm/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/avr32/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/blackfin/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/m68k/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/microblaze/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/mips/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/nds32/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/nios2/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/openrisc/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/powerpc/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/sandbox/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/sh/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/sparc/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/x86/include/asm/errno.h

-#include <asm-generic/errno.h>

arch/xtensa/include/asm/errno.h

-#include <asm-generic/errno.h>