efi: Fix build error due to enum collision between efi.h and ima.h

The following commit:

  a893ea15d764 ("tpm: move tpm_chip definition to include/linux/tpm.h")

introduced a build error when both IMA and EFI are enabled:

    In file included from ../security/integrity/ima/ima_fs.c:30:
    ../security/integrity/ima/ima.h:176:7: error: redeclaration of enumerator "NONE"

What happens is that both headers (ima.h and efi.h) defines the same
'NONE' constant, and it broke when they started getting included from
the same file:

Rework to prefix the EFI enum with 'EFI_*'.

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.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
Link: http://lkml.kernel.org/r/20190215165551.12220-2-ard.biesheuvel@linaro.org
[ Cleaned up the changelog a bit. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/platform/efi/quirks.c

@@ -717,7 +717,7 @@ void efi_recover_from_page_fault(unsigned long phys_addr)
 	 * "efi_mm" cannot be used to check if the page fault had occurred
 	 * in the firmware context because efi=old_map doesn't use efi_pgd.
 	 */
-	if (efi_rts_work.efi_rts_id == NONE)
+	if (efi_rts_work.efi_rts_id == EFI_NONE)
 		return;
 
 	/*
@@ -742,7 +742,7 @@ void efi_recover_from_page_fault(unsigned long phys_addr)
 	 * because this case occurs *very* rarely and hence could be improved
 	 * on a need by basis.
 	 */
-	if (efi_rts_work.efi_rts_id == RESET_SYSTEM) {
+	if (efi_rts_work.efi_rts_id == EFI_RESET_SYSTEM) {
 		pr_info("efi_reset_system() buggy! Reboot through BIOS\n");
 		machine_real_restart(MRR_BIOS);
 		return;