poly_tomont ppc64le: address review nits

Drop the inline attribution line (no names / PR numbers in file
bodies) and restore the auto-generated SCU comment in the dev source.
No code change.

Author: Scottcjn

dev/ppc64le/src/poly_tomont_ppc_asm.S

@@ -4,7 +4,6 @@
  * SPDX-License-Identifier: Apache-2.0 OR ISC OR MIT
  *
  * Written by Danny Tsen <dtsen@us.ibm.com>
- * poly_tomont frame trim (#1722) by Scott Boudreaux.
  */
 
 /*
@@ -175,7 +174,8 @@ MLK_ASM_FN_SYMBOL(poly_tomont_ppc_asm)
         addi    1, 1, 224
         blr
 
-/* To facilitate single-compilation-unit (SCU) builds, undefine all macros. */
+/* To facilitate single-compilation-unit (SCU) builds, undefine all macros.
+ * Don't modify by hand -- this is auto-generated by scripts/autogen. */
 #undef rinp
 #undef V_FACTOR
 #undef V_FACTOR_TW

mlkem/src/native/ppc64le/src/poly_tomont_ppc_asm.S

@@ -4,7 +4,6 @@
  * SPDX-License-Identifier: Apache-2.0 OR ISC OR MIT
  *
  * Written by Danny Tsen <dtsen@us.ibm.com>
- * poly_tomont frame trim (#1722) by Scott Boudreaux.
  */
 
 /*
@@ -201,54 +200,6 @@ MLK_ASM_FN_SYMBOL(poly_tomont_ppc_asm)
         stxvd2x 50, 9, 3
         stxvd2x 55, 10, 3
         stxvd2x 39, 11, 3
-        lxvd2x 45, 0, 3
-        addi 3, 3, 16
-        lxvd2x 50, 0, 3
-        addi 3, 3, 16
-        lxvd2x 55, 0, 3
-        addi 3, 3, 16
-        lxvd2x 39, 0, 3
-        addi 3, 3, 16
-        vmhraddshs 14, 13, 2, 3
-        vmhraddshs 19, 18, 2, 3
-        vmhraddshs 24, 23, 2, 3
-        vmhraddshs 8, 7, 2, 3
-        vmladduhm 13, 13, 0, 3
-        vmladduhm 18, 18, 0, 3
-        vmladduhm 23, 23, 0, 3
-        vmladduhm 7, 7, 0, 3
-        vmladduhm 27, 14, 5, 13
-        vmladduhm 28, 19, 5, 18
-        vmladduhm 29, 24, 5, 23
-        vmladduhm 30, 8, 5, 7
-        lxvd2x 45, 0, 3
-        addi 3, 3, 16
-        lxvd2x 50, 0, 3
-        addi 3, 3, 16
-        lxvd2x 55, 0, 3
-        addi 3, 3, 16
-        lxvd2x 39, 0, 3
-        addi 3, 3, 16
-        vmhraddshs 14, 13, 2, 3
-        vmhraddshs 19, 18, 2, 3
-        vmhraddshs 24, 23, 2, 3
-        vmhraddshs 8, 7, 2, 3
-        vmladduhm 13, 13, 0, 3
-        vmladduhm 18, 18, 0, 3
-        vmladduhm 23, 23, 0, 3
-        vmladduhm 7, 7, 0, 3
-        vmladduhm 13, 14, 5, 13
-        vmladduhm 18, 19, 5, 18
-        vmladduhm 23, 24, 5, 23
-        vmladduhm 7, 8, 5, 7
-        stxvd2x 59, 4, 3
-        stxvd2x 60, 5, 3
-        stxvd2x 61, 6, 3
-        stxvd2x 62, 7, 3
-        stxvd2x 45, 8, 3
-        stxvd2x 50, 9, 3
-        stxvd2x 55, 10, 3
-        stxvd2x 39, 11, 3
         li 6, 128
         li 7, 144
         li 8, 160