Fix Coverity #261967, Infinite loop

Coverity has identified that the __aeabi_imod function will loop forever
if the denominator is not a power of 2, which is probably not the
desired behaviour.

The functions in the rest of the file are compiler implementations of
division if ARMv7 does not implement division which is permitted by the
spec. However, while most of the functions in the file are documented
and referenced in other places online, __aeabi_uimod and __aeabi_imod
are not. For this reason, these functions have been removed from the
code base, which also removes the Coverity error.

Change-Id: I20066d72365329a8b03a5536d865c4acaa2139ae
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>