efi: Remove duplicate 'const' specifiers

gcc-7 shows these harmless warnings:

  drivers/firmware/efi/libstub/secureboot.c:19:27: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
   static const efi_char16_t const efi_SecureBoot_name[] = {
  drivers/firmware/efi/libstub/secureboot.c:22:27: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]

Removing one of the specifiers gives us the expected behavior.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Reviewed-by: David Howells <dhowells@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Josh Boyer <jwboyer@fedoraproject.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Fixes: de8cb458 ("efi: Get and store the secure boot status")
Link: http://lkml.kernel.org/r/20170526113652.21339-3-matt@codeblueprint.co.ukSigned-off-by: Ingo Molnar <mingo@kernel.org>

drivers/firmware/efi/libstub/secureboot.c

@@ -16,10 +16,10 @@
 
 /* BIOS variables */
 static const efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
-static const efi_char16_t const efi_SecureBoot_name[] = {
+static const efi_char16_t efi_SecureBoot_name[] = {
 	'S', 'e', 'c', 'u', 'r', 'e', 'B', 'o', 'o', 't', 0
 };
-static const efi_char16_t const efi_SetupMode_name[] = {
+static const efi_char16_t efi_SetupMode_name[] = {
 	'S', 'e', 't', 'u', 'p', 'M', 'o', 'd', 'e', 0
 };