Patch from Dirk Behme

Remove the following warnings from csumpartialcopygeneric.S:

arch/arm/lib/csumpartialcopygeneric.S: Assembler messages:
arch/arm/lib/csumpartialcopygeneric.S:142: Warning: shift of 0 ignored.
arch/arm/lib/csumpartialcopygeneric.S:216: Warning: shift of 0 ignored.
arch/arm/lib/csumpartialcopygeneric.S:268: Warning: shift of 0 ignored.
arch/arm/lib/csumpartialcopygeneric.S:322: Warning: shift of 0 ignored.
arch/arm/lib/csumpartialcopygeneric.S:328: Warning: shift of 0 ignored.

This new patch is reviewed by Nicolas Pitre.