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>

include/linux/efi.h

@@ -1719,19 +1719,19 @@ extern int efi_tpm_eventlog_init(void);
  * fault happened while executing an efi runtime service.
  */
 enum efi_rts_ids {
-	NONE,
-	GET_TIME,
-	SET_TIME,
-	GET_WAKEUP_TIME,
-	SET_WAKEUP_TIME,
-	GET_VARIABLE,
-	GET_NEXT_VARIABLE,
-	SET_VARIABLE,
-	QUERY_VARIABLE_INFO,
-	GET_NEXT_HIGH_MONO_COUNT,
-	RESET_SYSTEM,
-	UPDATE_CAPSULE,
-	QUERY_CAPSULE_CAPS,
+	EFI_NONE,
+	EFI_GET_TIME,
+	EFI_SET_TIME,
+	EFI_GET_WAKEUP_TIME,
+	EFI_SET_WAKEUP_TIME,
+	EFI_GET_VARIABLE,
+	EFI_GET_NEXT_VARIABLE,
+	EFI_SET_VARIABLE,
+	EFI_QUERY_VARIABLE_INFO,
+	EFI_GET_NEXT_HIGH_MONO_COUNT,
+	EFI_RESET_SYSTEM,
+	EFI_UPDATE_CAPSULE,
+	EFI_QUERY_CAPSULE_CAPS,
 };
 
 /*