MIPS: lib: Remove '.hidden' for local symbols

After a recent change in binutils that warns when local symbols have
non-default visibility [1], there are a couple instances when building
arch/mips:

  Assembler messages:
  {standard input}: Warning: local symbol `__memset' has non-default visibility
  Assembler messages:
  {standard input}: Warning: local symbol `__memcpy' has non-default visibility

Remove the '.hidden' directives for these symbols to clear up the
warnings, as they are pointless with a local symbol, which is by
definition hidden. This results in no changes to these symbols in nm's
output when assembled with various copies of binutils.

Closes: https://lore.kernel.org/20260509122517.GA1108596@ax162/
Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=c4150acbda1b3ce0602f79cbb7700b39e577be7e [1]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/lib/memcpy.S

@@ -274,7 +274,6 @@
 	/* initialize __memcpy if this the first time we execute this macro */
 	.ifnotdef __memcpy
 	.set __memcpy, 1
-	.hidden __memcpy /* make sure it does not leak */
 	.endif
 
 	/*
@@ -538,7 +537,6 @@
 	.if __memcpy == 1
 	END(memcpy)
 	.set __memcpy, 0
-	.hidden __memcpy
 	.endif
 
 .Ll_exc_copy\@:

arch/mips/lib/memset.S

@@ -89,7 +89,6 @@
 	/* Initialize __memset if this is the first time we call this macro */
 	.ifnotdef __memset
 	.set __memset, 1
-	.hidden __memset /* Make sure it does not leak */
 	.endif
 
 	sltiu		t0, a2, STORSIZE	/* very small region? */
@@ -231,7 +230,6 @@
 	.if __memset == 1
 	END(memset)
 	.set __memset, 0
-	.hidden __memset
 	.endif
 
 #ifdef CONFIG_CPU_NO_LOAD_STORE_LR