ANDROID: GKI: Fix symbol list wildcard

Update target dependencies for the vendor symbol list to
generate gki_module_unprotected.h with an extra _ for
the wildcard. This makes sure that all abi_gki_aarch64_<vendor>
files are being depend on but not abi_gki_aarch64.xml

Bug: 261722616
Bug: 232430739
Test: TH
Fixes: 0a903fe8 ("ANDROID: GKI: Header generation fix and
improvements")
Change-Id: Ic414492b1fcae14d41df234e73d0fd4601e33523
Signed-off-by: Ramji Jiyani <ramjiyani@google.com>