Preserve callee-saved registers in aarch64 AES-CTR code

The AES-CTR assembly code uses v8-v15 registers, they are
callee-saved registers, they must be preserved before the
use and restored after the use.

Change-Id: If9192d1f0f3cea7295f4b0d72ace88e6e8067493

crypto/aes/asm/aesv8-armx.pl

@@ -1780,8 +1780,12 @@ ()
 ${prefix}_ctr32_encrypt_blocks_unroll12_eor3:
 	AARCH64_VALID_CALL_TARGET
 	// Armv8.3-A PAuth: even though x30 is pushed to stack it is not popped later.
-	 stp		x29,x30,[sp,#-16]!
-	 add		x29,sp,#0
+	stp		x29,x30,[sp,#-80]!
+	stp		d8,d9,[sp, #16]
+	stp		d10,d11,[sp, #32]
+	stp		d12,d13,[sp, #48]
+	stp		d14,d15,[sp, #64]
+	add		x29,sp,#0
 
 	 ldr		$rounds,[$key,#240]
 
@@ -2486,7 +2490,11 @@ ()
 	vst1.8		{$in0},[$out],#16
 
 .Lctr32_done_unroll:
-	ldr		x29,[sp],#16
+	ldp		d8,d9,[sp, #16]
+	ldp		d10,d11,[sp, #32]
+	ldp		d12,d13,[sp, #48]
+	ldp		d15,d16,[sp, #64]
+	ldr		x29,[sp],#80
 	ret
 .size	${prefix}_ctr32_encrypt_blocks_unroll12_eor3,.-${prefix}_ctr32_encrypt_blocks_unroll12_eor3
 ___