Bionic/libm: Fix the mismatch ENTRY/END in e_pow.S

Change-Id: Ibe53e7863f462a63029d1154f317256c00814c6d
Revert "Bionic/libm: Fix the mismatch ENTRY/END in e_pow.S"

This reverts commit 96416f98a65202f94d59f6a7239fd97dbb7ea698.