Hexagon fails to build after the final patch that makes CONFIG_HAS_IOPORT
optional:

In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:854:18: error: static declaration of 'ioread8' follows non-static declaration
  854 | static inline u8 ioread8(const volatile void __iomem *addr)
      |                  ^
include/asm-generic/io.h:853:17: note: expanded from macro 'ioread8'
  853 | #define ioread8 ioread8
      |                 ^
include/asm-generic/iomap.h:29:21: note: previous declaration is here
   29 | extern unsigned int ioread8(const void __iomem *);
      |                     ^

As it turns out, most of its asm/io.h and lib/io.c files is redundant now,
and just removing all that makes it build again.

As with the other architectures, defining the __raw_readl()/__raw_writel()
type functions instead of the non-__raw ones is better here for consistency.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Add the compiler-rt builtins like memcpy to the hexagon kernel.

Signed-off-by: Sid Manning <sidneym@codeaurora.org>
Add SYM_FUNC_START/END, ksyms exports
Signed-off-by: Brian Cain <bcain@codeaurora.org>

Tested-by: Nick Desaulniers <ndesaulniers@google.com>

Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Linas Vepstas <linas@codeaurora.org>
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>