crypto: arm/aes - avoid reserved 'tt' mnemonic in asm code

The ARMv8-M architecture introduces 'tt' and 'ttt' instructions,
which means we can no longer use 'tt' as a register alias on recent
versions of binutils for ARM. So replace the alias with 'ttab'.

Fixes: 81edb426 ("crypto: arm/aes - replace scalar AES cipher")
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/arm/crypto/aes-cipher-core.S

@@ -18,7 +18,7 @@
 	rounds		.req	r1
 	in		.req	r2
 	out		.req	r3
-	tt		.req	ip
+	ttab		.req	ip
 
 	t0		.req	lr
 	t1		.req	r2
@@ -34,9 +34,9 @@
 
 	.macro		__load, out, in, idx
 	.if		__LINUX_ARM_ARCH__ < 7 && \idx > 0
-	ldr		\out, [tt, \in, lsr #(8 * \idx) - 2]
+	ldr		\out, [ttab, \in, lsr #(8 * \idx) - 2]
 	.else
-	ldr		\out, [tt, \in, lsl #2]
+	ldr		\out, [ttab, \in, lsl #2]
 	.endif
 	.endm
 
@@ -136,7 +136,7 @@
 	eor		r6, r6, r10
 	eor		r7, r7, r11
 
-	__adrl		tt, \ttab
+	__adrl		ttab, \ttab
 
 	tst		rounds, #2
 	bne		1f
@@ -146,7 +146,7 @@
 
 1:	subs		rounds, rounds, #4
 	\round		r8, r9, r10, r11, r4, r5, r6, r7
-	__adrl		tt, \ltab, ls
+	__adrl		ttab, \ltab, ls
 	\round		r4, r5, r6, r7, r8, r9, r10, r11
 	bhi		0b