ARM: OMAP2: drop explicit assembler architecture

OMAP2 depends on ARCH_MULTI_V6, which makes sure that the kernel is
compiled with -march=armv6. The compiler frontend will pass the
architecture to the assembler. There is no explicit architecture
specification necessary.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Olof Johansson <olof@lixom.net>