Revert "mmc: davinci: Don't strip remove function when driver is builtin"

This reverts commit aea35157 which is
commit 55c421b3 upstream.

It breaks the Android kernel build and is not needed.

Change-Id: I1b2418c7356e1018ea966cf157f0b4c1ee15d4b2
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>