sm8250-common: Rename libstdc++.vendor to libstdc++_vendor

* Ref: SkylineUI/bionic@a05a8c7

* Fixes:

F (6)[617:linkerconfig]: duplicate: libstdc++.so is
provided by default and system in [vendor] 08-04
05:31:23.337 1 1 I (5)[1:init]linkerconfig: libc:
Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid
617 (linkerconfig), pid 617 (linkerconfig) 08-04
05:31:23.367 620 620 E (6)[620:crash_dump64]DEBUG:
*** *** *** *** *** *** *** *** *** *** *** *** ***
name: linkerconfig >>>
/apex/com.android.runtime/bin/linkerconfig <<< 08-04
05:31:23.367 620 620 E (6)[620:crash_dump64]DEBUG:
uid: 0 08-04 05:31:23.367 620 620 E
(6)[620:crash_dump64]DEBUG: signal 6 (SIGABRT), code
-1 (SI_QUEUE), fault addr -------- 08-04
05:31:23.367 620 620 E (6)[620:crash_dump64]DEBUG:
Abort message: 'duplicate: libstdc++.so

Signed-off-by: kaderbava <ksbava7325@gmail.com>
Signed-off-by: SathamHussainM <sathamhussain.m11@gmail.com>