FROMLIST: rename missed uaccess .fixup section

When the uaccess .fixup section was renamed to .text.fixup, one case was
missed. Under ld.bfd, the orphaned section was moved close to .text
(since they share the "ax" bits), so things would work normally on
uaccess faults. Under ld.lld, the orphaned section was placed outside
the .text section, making it unreachable.

Fixes: c4a84ae ("ARM: 8322/1: keep .text and .fixup regions closer together")
Link: ClangBuiltLinux/linux#282
Link: https://bugs.chromium.org/p/chromium/issues/detail?id=1020633#c44
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/lkml/202002071754.F5F073F1D@keescook/
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: Ard Biesheuvel <[email protected]>
Reviewed-by: Nick Desaulniers <[email protected]>

Bug: 149493767
(am from https://www.armlinux.org.uk/developer/patches/viewpatch.php?id=8958/1)
Signed-off-by: Nick Desaulniers <[email protected]>
Change-Id: I39a2d2e7bfee7ff9854782c06547c277895e8ec1

Author: kees

arch/arm/lib/copy_from_user.S

@@ -100,7 +100,7 @@ ENTRY(arm_copy_from_user)
 
 ENDPROC(arm_copy_from_user)
 
-	.pushsection .fixup,"ax"
+	.pushsection .text.fixup,"ax"
 	.align 0
 	copy_abort_preamble
 	ldmfd	sp!, {r1, r2, r3}