ANDROID: Revert "x86/build: Move _etext to actual end of .text"

This reverts commit 392bef70.

Bug: 132629930
Bug: 120440614
Test: Building gki x86 config successfully
Change-Id: Iecf8a8e0c74850112cc4f6f9b4b5e0713e158a77
Signed-off-by: Ram Muthiah <rammuthiah@google.com>