Revert "modpost: skip ELF local symbols during section mismatch check"

This reverts commit a4d26f1a.

The variable 'fromsym' never starts with ".L" since commit 87e5b1e8
("module: Sync code of is_arm_mapping_symbol()").

In other words, Pattern 6 is now dead code.

Previously, the .LANCHOR1 hid the symbols listed in Pattern 2.

87e5b1e8 provided a better solution.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>